14．小数四则混合运算 1. 4 2 0.04 4 0.19 0.12 2. 0.24 1.25 4.7 1.3 2 0.01 3. 40.4÷0.5+7.5 =80.8+7.5 =88.3 40.4÷（0.5+7.5） =40.4÷8 =5.05 0.01×（3.5÷0.07－25） =0.01×（50－25） =0.01×25 =0.25 [5×（3.2+4.06﹚]÷1.2 =[5×7.26]÷1.2 =36.3÷1.2 =30.25 4. 1.25×0.7×8 =1.25×8×0.7 =10×0.7 =7 7.02+3.9+1.98+2.1 =（7.02+1.98）+（3.9+2.1) =9+6 = 15 |
