(27.8-15.6)乘0.8的简便算法
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(27.8-15.6)×0.8
=[27.8-(17.8-2.2)]×0.8
=(27.8-17.8+2.2)×0.8
=(10+2.2)×0.8
=8+1.76
=9.76
=[27.8-(17.8-2.2)]×0.8
=(27.8-17.8+2.2)×0.8
=(10+2.2)×0.8
=8+1.76
=9.76
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