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 40.4÷(0.5+7.5)
= 80.8+7.5 = 40.4÷8
= 88.3 = 5.05
0.01×(3.5÷0.07-25) [5×(3.2+4.06﹚]÷1.2
= 0.01×(50-25) = [5×7.26]÷1.2
= 0.01×25 = 36.3÷1.2
= 0.25 = 30.25
4: 1.25×0.7×8 7.02+3.9+1.98+2.1
= 1.25×8×0.7 =(7.02+1.98)+(3.9+2.1)
= 10×0.7 = 9+6
= 7 = 15