2021年浙教版数学第四章第1节同步练习题(八年级).pdf

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1、第 1 页浙教版数学第四章第1 节同步练习题八年级在考试中能否取得好成绩不仅需要好的心态,还需要在考试中对于各种题型都能熟练应对,下面由查字典数学网为大家整理了浙教版数学第四章第1 节同步练习题八年级 ,供大家参考。【知识盘点】1._ 称为真命题;_ 称为假命题.2.经过长期实践后公认为正确的命题叫做_,_ 叫做定理.3.能被 3 整除的整数 ,它的末位数是3 是_命题(?填真或假).4.把同旁内角互补,两直线平行写成如果_,那么_.5.两点之间线段最短是_(填定义或公理或定理).6.一次函数 y=kx-2,当 k0 时,y随 x 的增大而增大是一个_命题(填真或假).【根底过关】7.以下命题

2、中的真命题是()A.锐角大于它的余角 B.锐角大于它的补角C.钝角大于它的补角 D.锐角与钝角之和等于平角8.以下命题中 ,属于假命题的是()A.假设 ab,bc,那么 ab B.假设 ab,b c,那么ac精品w o r d 学习资料 可编辑资料-精心整理-欢迎下载-第 1 页，共 3 页第 2 页C.假设 ac,bc,那么 ab D.假设 ac,b a,那么bc 9.有以下四个命题：(1)对顶角相等;(2)内错角相等;(3)有两边和其中一边的对角对应相等的两个三角形全等;(4)如果两条直线都垂直于第三条直线,?那么这两条直线平行.其中真命题有()A.1 个 B.2 个 C.3 个 D.4

3、个10.等腰三角形的一边等于3,一边等于 6,那么它的周长等于()A.12 B.12或 15 C.15 D.15或 18 11.以下说法正确的选项是()A.命题一定是正确的 B.不正确的判断就不是命题C.真命题都是公理 D.定理都是真命题12.a、b 是实数 ,假设 ab,那么 a2b2 显然是错误的 ,假设结论保持不变 ,怎样改变条件 ,才能使之成立?以下四种改法：(1)假设 a0,那么 a2(2)假设 ab 且 a+b0,那么 a2(3)?假设 ab2;(4)假设 ab2;其中正确的改法个数是()A.1 个 B.2 个 C.3 个 D.4 个【应用拓展】13.判断以下命题是真命题还是假命题

4、,并说明理由.(1)如果 ab0,那么 a0,b(2)内错角相等.14.A,B,C,D,E五名学生参加某次数学单元检测,?在未公布成绩前他们对自己的数学成绩进行了猜测.精品w o r d 学习资料 可编辑资料-精心整理-欢迎下载-第 2 页，共 3 页文档编码:CF7W4J1T9I4 HR7C8M9Q9J10 ZF8V4H3T5W8文档编码:CF7W4J1T9I4 HR7C8M9Q9J10 ZF8V4H3T5W8文档编码:CF7W4J1T9I4 HR7C8M9Q9J10 ZF8V4H3T5W8文档编码:CF7W4J1T9I4 HR7C8M9Q9J10 ZF8V4H3T5W8文档编码:CF7W4

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8、W4J1T9I4 HR7C8M9Q9J10 ZF8V4H3T5W8文档编码:CF7W4J1T9I4 HR7C8M9Q9J10 ZF8V4H3T5W8文档编码:CF7W4J1T9I4 HR7C8M9Q9J10 ZF8V4H3T5W8文档编码:CF7W4J1T9I4 HR7C8M9Q9J10 ZF8V4H3T5W8文档编码:CF7W4J1T9I4 HR7C8M9Q9J10 ZF8V4H3T5W8文档编码:CF7W4J1T9I4 HR7C8M9Q9J10 ZF8V4H3T5W8文档编码:CF7W4J1T9I4 HR7C8M9Q9J10 ZF8V4H3T5W8文档编码:CF7W4J1T9I4 HR7C

9、8M9Q9J10 ZF8V4H3T5W8文档编码:CF7W4J1T9I4 HR7C8M9Q9J10 ZF8V4H3T5W8文档编码:CF7W4J1T9I4 HR7C8M9Q9J10 ZF8V4H3T5W8文档编码:CF7W4J1T9I4 HR7C8M9Q9J10 ZF8V4H3T5W8文档编码:CF7W4J1T9I4 HR7C8M9Q9J10 ZF8V4H3T5W8文档编码:CF7W4J1T9I4 HR7C8M9Q9J10 ZF8V4H3T5W8文档编码:CF7W4J1T9I4 HR7C8M9Q9J10 ZF8V4H3T5W8文档编码:CF7W4J1T9I4 HR7C8M9Q9J10 ZF8V

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11、说：如果我得优,那么 B也得优B说：如果我得优,那么 C也得优C说：如果我得优,那么 D也得优D说：如果我得优,那么 E也得优.成绩揭晓后 ,发现他们都没说错,但只有三个人得优.请问：得优的是哪三位同学?【综合提高】15.如下图 ,ABBD 于点 B,EDBD于点 D,且 AB=CD,BC=DE,那么 AC与 CE有什么关系?写出你的猜测 ,并说明理由.精品w o r d 学习资料 可编辑资料-精心整理-欢迎下载-第 3 页，共 3 页文档编码:CF7W4J1T9I4 HR7C8M9Q9J10 ZF8V4H3T5W8文档编码:CF7W4J1T9I4 HR7C8M9Q9J10 ZF8V4H3T5

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