0.75乘三点九加0.75乘二点五减零点八乘0.75用简便方法计算
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0.75×3.9+0.75×2.5-0.8×0.75
=0.75×(3.9+2.5-0.8)
=0.75×5.6
=4分之3×5.6
=3×1.4
=4.2
=0.75×(3.9+2.5-0.8)
=0.75×5.6
=4分之3×5.6
=3×1.4
=4.2
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