3.1×1.2×0.5 (2.5-0.25)×0.4 5.6×3.1×1.2×0.5 (2.5-0.25)×0.4 5.6×101怎么简便

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3.1×1.2×0.5(2.5-0.25)×0.45.6×3.1×1.2×0.5(2.5-0.25)×0.45.6×101怎么简便3.1×1.2×0.5(2.5-0.25)×0.45.6×3.1×1.

3.1×1.2×0.5 (2.5-0.25)×0.4 5.6×3.1×1.2×0.5 (2.5-0.25)×0.4 5.6×101怎么简便
3.1×1.2×0.5 (2.5-0.25)×0.4 5.6×
3.1×1.2×0.5 (2.5-0.25)×0.4 5.6×101怎么简便

3.1×1.2×0.5 (2.5-0.25)×0.4 5.6×3.1×1.2×0.5 (2.5-0.25)×0.4 5.6×101怎么简便
1、3.1x(1.2x0.5)=3.1x0.6=1.88
2、2.5x0.4+0.25x0.4=1+0.1=1.1
3、5.6x100+5.6x1=560+5.6=565.6