算一算.
81÷9= | 8×9-27= | 45÷5+21= | 3×3×6= | 4×9÷6= |
36÷4÷3= | 2×4×5= | 63÷9×4= | 3×8-11= | 40-4×9= |
30÷6×9= | 72÷8÷3= | 8×9-9= | 6×9-6= | 9×9-30= |
解方程:
3.6X=2.88 | X÷11=1.1 | X+43.5=100. |
口算:
2 1×0.7= | 16×3.2= | 0.98×14= |
23÷1000= | 3.6÷0.36= | 0.85+0.2+0.7= |
2÷0.25= | 12.5-7.5+2.5= | 1-0.3×0.2= |