81.5×15.8﹢8.15×518﹢67.6×18.5= 这道题用简算怎么算 ???
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81.5×15.8﹢8.15×518﹢67.6×18.5
=8.15×15.8×10+8.15×518+67.6×18.5
=8.15×158+8.15×518+67.6×18.5
=8.15×(158+518)+67.6×18.5
=8.15×676+67.6×18.5
=67.6×10×8.15+67.6×18.5
=67.6×81.5+67.6×18.5
=67.6×(81.5+18.5)
=67.6×100
=6760
=8.15×15.8×10+8.15×518+67.6×18.5
=8.15×158+8.15×518+67.6×18.5
=8.15×(158+518)+67.6×18.5
=8.15×676+67.6×18.5
=67.6×10×8.15+67.6×18.5
=67.6×81.5+67.6×18.5
=67.6×(81.5+18.5)
=67.6×100
=6760
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