七年级数学上册2.7《有理数的乘法》测试(含解析)(新版)北师大版.doc

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1有理数的乘法测试时间:60 分钟 总分: 100一、选择题(本大题共 8小题,共 32.0分)1. 若 ,则下列各式正确的是 02. 算式 之值为何? (112)(314)23 ( )A. B. C. D. 14 1112 114 1343. 计算 的值是 (3)9 ( )A. 6 B. 27 C. D. 12 274. 已知 , , ,下列结论正确的是 0 0 0 0 0 0 05. 下列说法正确的是 ( )A. 同号两数相乘,取原来的符号B. 一个数与 相乘,积为该数的相反数1C. 一个数与 0相乘仍得这个数D. 两个数相乘,积大于任何一个乘数6. 的结果是 (2)3 ( )A. B. 1 C. D. 65 67. 有理数 ,则 的值是 12. 或 9 113. 90 14. 179915. 0或 2或 4 16. 10 17. 解:原式 =12+48 =1618. 解:原式 ,=16(48)+34(48)112(48)=836+4 =2419. 解:(19+1612)18=1918+16181218=2+39=59 =420. 解: , ,|=3 |=5, ,=3 =5,0所以 =3所以 =32=522. 440; ; ; 4290 13(+1)(+2)14(+1)(+2)(+3)

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