(2.5+0.25)×0.4+2.75×0.6怎样计算简便?
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(2.5+0.25)*0.4+2.75*0.6
=2.75*0.4+2.75*0.6
=2.75*(0.4+0.6)
=2.75*1
=2.75
=2.75*0.4+2.75*0.6
=2.75*(0.4+0.6)
=2.75*1
=2.75
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(2.5+0.25)×0.4+2.75×0.6
=2.5*0.4+0.25*0.4+2*0.6+0.75*0.6
=1+0.1+1.2+0.45
=2.3+0.45
=2.75
=2.5*0.4+0.25*0.4+2*0.6+0.75*0.6
=1+0.1+1.2+0.45
=2.3+0.45
=2.75
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