7.5×23+31×2.5 0.79×0.46+7.9×0.24+11.4×0.079要简便算法

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7.5×23+31×2.50.79×0.46+7.9×0.24+11.4×0.079要简便算法7.5×23+31×2.50.79×0.46+7.9×0.24+11.4×0.079要简便算法7.5×23

7.5×23+31×2.5 0.79×0.46+7.9×0.24+11.4×0.079要简便算法
7.5×23+31×2.5 0.79×0.46+7.9×0.24+11.4×0.079
要简便算法

7.5×23+31×2.5 0.79×0.46+7.9×0.24+11.4×0.079要简便算法
7.5×23+31×2.5 0.79×0.46+7.9×0.24+11.4×0.079
=2.5×3×23+31×2.5 =7.9×0.046+7.9×0.24+7.9×0.114(根据积不变的规律)
=2.5×(69+31) =7.9×(0.046+0.24+0.114)(根据乘法分配律)
=2.5×100 =7.9×0.4
=250 =3.16