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12.5×1.6×0.25简便
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12.5×1.6×0.25简便
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12.5×1.6×0.25
=(1+2.5)×0.4x4×0.25
=(1+2.5)×0.4x(4×0.25)
=(1+2.5)×0.4x(1)
=1x0.4+2.5x0.4
=0.4+1
=1.4
=(1+2.5)×0.4x4×0.25
=(1+2.5)×0.4x(4×0.25)
=(1+2.5)×0.4x(1)
=1x0.4+2.5x0.4
=0.4+1
=1.4
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