(山西专版)2018年秋七年级数学上册第一章有理数1.4有理数的乘除法1.4.1有理数的乘法(一)课时训练(无答案)(新版)新人教版.doc

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(山西专版)2018年秋七年级数学上册第一章有理数1.4有理数的乘除法1.4.1有理数的乘法(一)课时训练(无答案)(新版)新人教版.doc_第1页
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11.4.1 有理数的乘法 (一)基础练习1 .计算(1) (+4)(-5) ; (2) (-0.125)(-8) ;(3) (-2 )(- 37) ; ( 4)0(-13.52) ;(5) (-3.25)(+ 1) ; (6) (-1)a2 .计算:(1) (-185.8)( -36 45)0(-25) ;(2) (-1 8)3(- 23)(-1 1) 3下列结论正确的是( )A两数之积为正,这两数同为正; B两数之积为负,这两数为异号C几个数相乘,积的符号由负因数的个数 决定D三数相乘,积为 负,这三个数都是负数4一 个有理数和它的相反数的积 ( )A符号必为正 B符号必为负C一定不大小 0 D一定不小于 05计 算(1) (-6)( +8) ; (2) (-0.36)(- 29) ; (3) (-2 2)(-2 14) ;(4) (-288 5)0; (5)2 14(-1 )(- )(- 87) ;(6) (-5)(-8)0(-10) (-15) ; ( 7) (-3 13)(- 0.12)(-2 14)331;(8) (+ 2)|- 3|2 14(-5 3) ; ( 9) (-3)(-4)(-5)+(-5)(-27) ;(10) (-0.1)(-1)(-100)-0.01(1000)

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