12.5*67+53*3.1+22*3.1 与327*2.8+17.3*28怎样计算简便?
问题描述：
12.5*67+53*3.1+22*3.1 与327*2.8+17.3*28怎样计算简便?
答
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不好意思， 这个应是
12.5×67+53×3.1+72×3.1