81.5×15.8﹢8.15×518﹢67.6×18.5
=81.5x15.8+81.5x51.8+67.6x18.5
=81.5x(15.8+51.8)+67.6x18.5
=81.5x67.6+67.6x18.5
=67.6x(81.5+18.5)
=67.6x100
=6760
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