0.75×5.7+2.5×0.57的简便算法?
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利用乘法分配律的逆运算
0.75×5.7+2.5×0.57
=0.75×5.7+5.7×0.1×2.5(恒等变形)
=0.75×5.7+5.7×0.25
=5.7×(0.75+0.25)(乘法分配律的逆运算)
=5.7×1
=5.7
0.75×5.7+2.5×0.57
=0.75×5.7+5.7×0.1×2.5(恒等变形)
=0.75×5.7+5.7×0.25
=5.7×(0.75+0.25)(乘法分配律的逆运算)
=5.7×1
=5.7
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