小数四则混合运算和简便运算(1) 1.3.52 12 0.02 0.25 0.006 0.42 0 24 2. 9.82+7.5×2.4 2.1÷(14.5-14.2) = 9.82+18 = 2.1÷0.3 = 27.82 = 7 (1-0.08×0.7)÷0.08 6.9÷[(0.4+1.9)×0.6] = (1-0.056)÷0.08 = 6.9÷(2.3×0.6) = 0.944÷0.08 = 6.9÷1.38 = 11.8 = 5 3. 0.453+7.88+0.547 9.3×99+9.3 = (0.453+0.547)+7.88 = 9.3×(99+1) = 1+7.88 = 9.3×100 = 8.88 = 930 0.25×3.7×0.4 0.72×125 = 0.25×0.4×0.37 = 0.09×8×125 = 0.1×3.7 = 0.09×(8×125) = 0.37 |