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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有理数的乘法第2课时乘法的运算律课件（新版）新人教版.ppt

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知识点 用运算律简化有理数的乘法运算,【思路点拨】 在进行多因数的乘法运算时,先确定式子中有没有因数0,若有结果直接为0,若没有可根据负因数的个数确定积的符号,再把绝对值相乘,同时考虑能否用乘法运算律简化运算过程.,解:(1)(-2)(-5)(-3) =-(253) =-30.,C,1.有奇数个负因数相乘,其积为( ) (A)正数 (B)负数 (C)非正数 (D)非负数,B,

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