12.5*67+53*3.1+22*3.1 与327*2.8+17.3*28怎样计算简便?

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12.5*67+53*3.1+22*3.1与327*2.8+17.3*28怎样计算简便?12.5*67+53*3.1+22*3.1与327*2.8+17.3*28怎样计算简便?12.5*67+53*3

12.5*67+53*3.1+22*3.1 与327*2.8+17.3*28怎样计算简便?
12.5*67+53*3.1+22*3.1 与327*2.8+17.3*28怎样计算简便?

12.5*67+53*3.1+22*3.1 与327*2.8+17.3*28怎样计算简便?
12.5×67+53×3.1+22×3.1
=12.5×67+(53+22)×3.1
=12.5×67+75×3.1
=12.5×67+12.5×6×3.1
=12.5×67+12.5×18.6
=12.5×(67+18.6)
=12.5×85.6
=12.5×8×10.7
=100×10.7
=1070


327×2.8+17.3×28
=327×2.8+173×2.8
=(327+173)×2.8
=500×2.8
=1400