解方程:
X-7.65=4.64 | 28.25-X=8.25 | X-(3.6+2.97)=12.42. |
口算
640+300= | 80+180= | 140-80= | 840-420= | 860+90= | 127+273= |
350+220= | 49÷7= | 27÷9= | 24÷6= | 45÷9= |
X-7.65=4.64 | 28.25-X=8.25 | X-(3.6+2.97)=12.42. |
640+300= | 80+180= | 140-80= | 840-420= | 860+90= | 127+273= |
350+220= | 49÷7= | 27÷9= | 24÷6= | 45÷9= |