3/8×0.3+0.7×0.75(简便计算)
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3/8×0.3+0.7×0.75
=0.75*0.15+0.7*0.75
=0.75*(0.15+0.7)
=0.75*0.85
=0.6375
=0.75*0.15+0.7*0.75
=0.75*(0.15+0.7)
=0.75*0.85
=0.6375
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