递等式计算(能简便的用简便方法).12.5×(0.7×0.8)70.8-0.8×0.513-3.79+6
递等式计算(能简便的用简便方法).12.5×(0.7×0.8)70.8-0.8×0.513-3.79+6.2112.5×(40+0.7)4.12-1.78-1.224.2...
递等式计算(能简便的用简便方法).12.5×(0.7×0.8)70.8-0.8×0.513-3.79+6.2112.5×(40+0.7)4.12-1.78-1.22 4.2÷0.7÷6.
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(1)12.5×(0.7×0.8), =12.5×0.8×0.7, =10×0.7, =7; (2)70.8-0.8×0.5, =70.8-0.4, =70.4; (3)13-3.79+6.21, =9.21+6.21, =15.42; (4)12.5×(40+0.7), =12.5×8×5+12.5×0.7, =500+8.75, =508.75; (5)4.12-1.78-1.22, =4.12-(1.78+1.22), =4.12-3, =1.12; (6)4.2÷0.7÷6, =4.2÷(0.7×6), =4.2÷4.2, =1. |
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