脱式计算,能简算的要简算.
0.389×4×0.25 | 21.97÷5÷2 | 30.8×12.6-30.8×2.6 | 4.05÷0.81+2.4. |
直接写得数: 4.6+2.4=________; | 7.5-5=________; | 0.6-0.2=________; | 9.2-1.2=________; |
5.4-2.5-1.4=________; | 12-6.2-3.8=________; | 1.7+0.43+3.3=________; | 1-0.2-0.3=________. |
0.389×4×0.25 | 21.97÷5÷2 | 30.8×12.6-30.8×2.6 | 4.05÷0.81+2.4. |
直接写得数: 4.6+2.4=________; | 7.5-5=________; | 0.6-0.2=________; | 9.2-1.2=________; |
5.4-2.5-1.4=________; | 12-6.2-3.8=________; | 1.7+0.43+3.3=________; | 1-0.2-0.3=________. |