口算:
100-53= | 48+52= | 50×8= | 2013×0= | 70000×9= |
45÷5= | 38÷9= | 102×8= | = | = |
直接写得数.
870-780= | -= | 0.99+0.1= | 14.4+56= |
7÷9= | 0.42×= | 5-= | ÷0.66= |
解方程
20%x+= | (1-12.5%)x=7 |
100-53= | 48+52= | 50×8= | 2013×0= | 70000×9= |
45÷5= | 38÷9= | 102×8= | = | = |
870-780= | -= | 0.99+0.1= | 14.4+56= |
7÷9= | 0.42×= | 5-= | ÷0.66= |
20%x+= | (1-12.5%)x=7 |