2.28×6.5+3.5×2.25怎么简便方法
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2.28×6.5+3.5×2.25
=(2+0.28)×6.5+3.5×(2+0.25)
=2×6.5+0.28×6.5+3.5×2+3.5×0.25
=13+1.82+7+0.875
=21+2.695
=22.695
咨询记录 · 回答于2022-01-04
2.28×6.5+3.5×2.25怎么简便方法
2.28×6.5+3.5×2.25=(2+0.28)×6.5+3.5×(2+0.25)=2×6.5+0.28×6.5+3.5×2+3.5×0.25=13+1.82+7+0.875=21+2.695=22.695
所以2.28×6.5+3.5×2.25=22.695
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