七年级数学上册第三章有理数的运算3.2《有理数的乘法与除法(3)》课件(新版)青岛版.ppt

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3.2 有理数的乘法与除法(3),温故知新,三个有理数相乘,可以任意交换因数的位置,或者先把其中的两个因数相乘.,一个数同两个数的和相乘,等于把这个数分别与这两个数相乘,再把积相加.,1.,2.,3.,多个有理数相乘,可以先确定积的符号,再把各因数的绝对值相乘.,几个有理数相乘,有一个因数是0,积就为0.,?,.,有理数的除法法则,例题讲解,0不能作除数,例题讲解,例6,课堂小节,.,有理数的除法法则,1.,2.,3.,作业,必做题:课本P65 习题3.2 第3、4题 选做题:课本P66 7、8题,

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