5.2×2-0.5×0.8的简便算法
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2.5*0.8-0.5*1.8
=2.5×0.8-0.5×(1+0.8)
=2.5×0.8-0.5×1-0.5×0.8
=(2.5×0.8-0.5×0.8)-0.5×1
=(2.5-0.5)×0.8-0.5
=2×0.8-0.5
=1.6-0.5
=1.1
=2.5×0.8-0.5×(1+0.8)
=2.5×0.8-0.5×1-0.5×0.8
=(2.5×0.8-0.5×0.8)-0.5×1
=(2.5-0.5)×0.8-0.5
=2×0.8-0.5
=1.6-0.5
=1.1
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