标签：6如何简便计算

7.5×0.8+1.2×12.5+2.5×1.6简便计算如下：7.5×0.8+1.2×12.5+2.5×1.6=0.8×7.5+2.5×2×0.8+1.2×12.5=7.5×0.8...