0.39+80×0.39×0.125怎样简便
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0.39+80×0.39×0.125
=0.39+0.39×(80×0.125)
=0.39+0.39×10
=0.39+3.9
=0.39+4-0.1
=4.29
=0.39+0.39×(80×0.125)
=0.39+0.39×10
=0.39+3.9
=0.39+4-0.1
=4.29
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