编者的话
亲爱的同学们，当你打开这本书时，会发现它有许许多多的不同．本书针对新课程标准编写，指导同学们在平时的数学学习中正确地评价自己．全书的章节安排主要依照华东师范大学出版社出版的“义务教育课程标准实验教科书，数学，八年级下册”，共五个单元．
本书中的每一小节均分为“知识与技能”和“实践与探索”两部分．
“知识与技能”主要考察同学们对基本数学知识的掌握．只有在牢牢掌握基本知识的前提下，同学们才能有进一步的提高．
“实践与探索”主要教给同学们在实际问题中应用所学到的数学知识的本领，引导同学们对某些数学问题做更深入地思考。
本书还提供了一些“实践活动”，同学们在课余可以按照书中所示，组织游戏或开展活动，在游戏、活动中加深对所学知识的理解．
“阅读材料”如同豹之一斑，让同学们循此而进，领悟更广阔的数学世界．
每一单元的结尾是该单元的自测题．通过测试，同学们可以了解自己对该单元知识的掌握程度．
第十八单元后与全书的最后分别提供了期中、期末测试题．期末测试题分为开卷和闭卷两部分，配合平时的学习，尽可能全面地检验同学们的学习成果．
同学们，在新学期中，这本书将始终伴随着你，使你在数学的学习中能够不断地成长，并且获得成功．
本书由孟祥静、晁振英、宋继全编写。如果同学们在使用本书的过程中，发现错误或遗漏，请予指正．让我们共同努力，使本书成为同学们学习数学的好帮手．
新课程、新标准、新评价编写组
2004年1月
<SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><STRONG>第十六单元 数的开方</STRONG></SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
16</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">1 </SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">平方根与立方根
</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">16</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">1</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（一）</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
16</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">1</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（二）</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
16</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">2 </SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">二次根式</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
16</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">2</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（一）</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
16</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">2</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（二）</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
16</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">3 </SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">实数与数轴</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"> 实践活动</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"> 阅读与思考</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"> 第十六单元自测题</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><STRONG>第十七单元 函数及其图像</STRONG></SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
17</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">1 </SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">变量与函数</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
17</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">2 </SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">函数的图像</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
17</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">3 </SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">一次函数</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
17</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">3</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（一）</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
17</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">3</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（二）</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
17</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">4 </SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">反比例函数</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
17</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">5 </SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">实践与探索</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"> 实践活动</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"> 阅读与思考</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"> 第十七单元自测题</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><STRONG>第十八单元 图形的相似</STRONG></SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
18</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">1 </SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">相似的图形</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
18</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">2 </SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">相似图形的特征</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
18</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">3 </SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">相似三角形</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
18</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">3</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（一）</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
18</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">3</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（二）
</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">18</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">3</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（三）
</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">18</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">3</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（四）</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
18</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">4 </SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">画相似图形</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
18</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">5 </SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">图形与坐标</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"> 实践活动</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"> 阅读与思考</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"> 第十八单元自测题
期中测试题</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><STRONG>第十九单元 解直角三角形</STRONG></SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
19</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">1 </SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">测量</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
19</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">2 </SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">勾股定理</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
19</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">3 </SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">锐角三角形</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
19</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">4 </SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">解直角三角形</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"> 实践活动</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"> 阅读与思考</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"> 第十九单元自测题</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><STRONG>第二十单元 数据的整理与初步处理</STRONG></SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
20</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">1 </SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">选择合适的图表进行数据整理</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
20</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">1</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（一）
</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt"> 20</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">1</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（二）
</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt"> 20</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">1</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（三）</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
20</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">2 </SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">极差、方差与标准差</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
20</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">2</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（一）
</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt"> 20</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">2</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（二）</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
20</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">3 </SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">机会大小的比较</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
20</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">3</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（一）
</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt"> 20</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">．</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">3</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（二）</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"> 实践活动</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"> 阅读与思考</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"> 第二十单元自测题</SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><STRONG>期末测试题</STRONG></SPAN><SPAN lang=EN-US style="FONT-SIZE: 11pt">
</SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><STRONG>参考答案</STRONG></SPAN>
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