7.2×14.5+17×2.8 简便计算

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7.2×14.5+17×2.8 简便计算

7.2×14.5+17×2.8 简便计算
7.2×14.5+17×2.8 简便计算

7.2×14.5+17×2.8 简便计算
7.2×14.5+17×2.8
=7.2×14.5+14.5×2.8 +2.5×2.8
=14.5×10+2.5×4×0.7
=145+10×0.7
=152

7.2×14.5+17×2.8
=7.2×14.5+14.5×2.8 +2.5×2.8
=14.5×10+2.5×4×0.7
=145+10×0.7
=152

用口算不如用笔算,用脑算不如用计算机算.