小数四则混合运算练习
1: × ÷
÷ +
2: 7.32 2.68
0.3 0.2
1.75 1
5.8 1
3: 0.8×0.68×125 90-3.54-11.46
= 0.8×125×0.68 = 90-(3.54+11.46)
= 100x0.68 = 90-15
= 68 = 75
3.6÷0.4-1.2×5 0.73×99+0.73
= 9-6 = 0.73×(99+1)
= 3 = 0.73×100
= 73(31.6-11.7)÷2.5÷0.4 3.75×99
=(31.6-11.7)÷(2.5×0.4) = 3.75×100-3.75
= 19.9÷1 = 375-3.75
= 19.9 = 371.25