2.5*1.4+2.5*0.4+1.4*0.4*2的简便方法?
2个回答
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解:2.5×1.4+2.5×0.4+1.4×0.4×2
=2.5×(1+0.4)+2.5×0.4+1.4×0.4×2
=2.5+2.5×0.4+2.5×0.4+1.4×0.4×2
=2.5+1+1+1.12
=5.62
=2.5×(1+0.4)+2.5×0.4+1.4×0.4×2
=2.5+2.5×0.4+2.5×0.4+1.4×0.4×2
=2.5+1+1+1.12
=5.62
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2.5x1.4+2.5x0.4+1.4X0.4x2
=2.5x(1.4+0.4)+1.4x0.4x2
=2.5x1.8+1.12
=4.5+1.12
=5.62
=2.5x(1.4+0.4)+1.4x0.4x2
=2.5x1.8+1.12
=4.5+1.12
=5.62
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