4.7*0.8+0.47*9.2简便方法?
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4.7*0.8+0.47*9.2
=4.7*0.8+4.7*0.92
=4.7*1.72
=1.72*(5-0.3)
=1.72*5-1.72*0.3
=8.6-0.516
=8.084
=4.7*0.8+4.7*0.92
=4.7*1.72
=1.72*(5-0.3)
=1.72*5-1.72*0.3
=8.6-0.516
=8.084
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