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简介：
1.乘法交换律、结合律
2.5×8.7×0.4
=2.5×0.4×8.7
=(2.5×0.4)×8.7
=1×8.7
=8.7
0.25×6.8×0.4
=0.25×0.4×6.8
=0.1×6.8
=0.68
2.5×1.75×8
=2.5×8×1.75
=20×1.75
=35
0.5×3.38×0.2
=0.5×0.2×3.38
=0.1×3.38
=0.338
0.4×68.9×0.25
=0.4×0.25×68.9
=0.1×68.9
=6.89
1.25×0.4×0.25×8
=1.25×8×0.4×0.25
=(1.25×8)×(0.4×0.25)
=10×0.1
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