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2.5×3.2=2.5×4×0.8=8
乘法结合律
乘法结合律
分析:乘法结合律是乘法运算的一种运算定律. 定义:三个数相乘,先把前两个数相乘,或先把后两个数相乘,积不变.
解答:解:2.5×3.2=2.5×4×0.8=8,
2.5×(4×0.8)=(2.5×4)×0.8=10×0.8=8,利用乘法结合律;
故答案为:乘法结合律.
点评:此题考查了运算定律与简便运算.
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