8.4x1.25Ⅹ0.25可以简便计算吗
3个回答
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原式=(8+0.4)×1.25×0.25
=8×1.25×0.25+0.4×1.25×0.25
=1.25×8×0.25+0.5×0.25
=1.25×2+0.125
=2.5+0.125
=2.625
=8×1.25×0.25+0.4×1.25×0.25
=1.25×8×0.25+0.5×0.25
=1.25×2+0.125
=2.5+0.125
=2.625
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8.4×1.25×0.25
=8.4×0.25×1.25
=8.4÷4×1.25
=2.1×1.25
=1.25×2+1.25×0.1
=2.5+0.125
=2.625
=8.4×0.25×1.25
=8.4÷4×1.25
=2.1×1.25
=1.25×2+1.25×0.1
=2.5+0.125
=2.625
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