，当冰融化水后，体积减少几分之几？口算．
| 0.6×5= | 1.3×2= | 9.4-0.4= |
| 5.1÷0.3= | 2÷0.02= | 6.5+3.07= |
| 4.3×2= | 2.1÷3= | 5.07×10= |
| 口算． 0.9+0.4= | 9-0.7= | 0.36+0.54= | 1-0.26= |
| 3.6+0.4= | 1.29-O.29= | 0.74+0.26= | 0.57-0.5= |
| 2.8+1.12= | 6.2+1.8= | 2.8-2.3= | 1.3-0.6= |
| 0.6×5= | 1.3×2= | 9.4-0.4= |
| 5.1÷0.3= | 2÷0.02= | 6.5+3.07= |
| 4.3×2= | 2.1÷3= | 5.07×10= |
| 口算． 0.9+0.4= | 9-0.7= | 0.36+0.54= | 1-0.26= |
| 3.6+0.4= | 1.29-O.29= | 0.74+0.26= | 0.57-0.5= |
| 2.8+1.12= | 6.2+1.8= | 2.8-2.3= | 1.3-0.6= |
，300km比________少25%．
用9个正方形纸片拼成的长方形的周长是________cm，面积是________cm2．