5/2乘以75%加上4.5×3/4×0.75的简便算法是多少？
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5/2×75%+4.5×3/4×0.75
=2.5×0.75+4.5×0.75×0.75
=0.75×(2.5+3.375)
=0.75×5.875
=4.40625
=2.5×0.75+4.5×0.75×0.75
=0.75×(2.5+3.375)
=0.75×5.875
=4.40625
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