7.5×23+31×2.5 0.79×0.46+7.9×0.24+11.4×0.079

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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

7.5*23+31*2.5简便运算 0.79*0.46+7.9*0.24+11.4*0.079的简便运算 0.79×0.46+7.9×0.24+11.4×0.079 0.79×0.46＋7.9×0.24＋11.4×0.079 0.79*0.46+7.9*0.24+11.4*0.079怎样简算 0.79 ×0.46+7.9 ×0.24+11.4×0.079 怎样算简便 0.79*0.46+7.9*0.24+11.4*0.079怎样简便运算? 0.79×0.46+7.9×0.24+11.4×0.079=?简便计算! 0.79乘以0.46加7.9乘以0.24加11.4乘以0.079怎样简便计算? 0.79*0.46 7.9*0.24 11.4*0.079用简便的方法怎么做 0.79乘0.46加7.9乘0.24加11.4乘0.079用简便方法计算? 0.79乘0.46加7.9乘0.24加11.4乘0.079怎样简算, 0.79乘0.46加7.9乘0.24加11.4乘0.079怎么简算,