已知300÷25=12，你能很快写出下面各题的得数吗？
| 3÷25= | 0.3÷0.25= | 0.03÷0.025= | 30÷25= |
| 30÷25= | 30÷0.25= | 300÷250= | 0.3÷2.5= |
直接写出计算结果
| 3.62+1.8= |  = |  = | 8×（12+0.5）= |
| 39005+2007= | 6.08-1.998= | 0.45÷0.9= |  = |
说一说如图2、3、4是由1怎么变换得到的？想一想算一算，能用简便计算的用简便计算．
| 0.25×8×125×4 | 9.8×25 | [16.7-（6.2+9.5）]×8.3 | 0.9×99+0.9． |
| 3÷25= | 0.3÷0.25= | 0.03÷0.025= | 30÷25= |
| 30÷25= | 30÷0.25= | 300÷250= | 0.3÷2.5= |
| 3.62+1.8= | = | = | 8×（12+0.5）= |
| 39005+2007= | 6.08-1.998= | 0.45÷0.9= | = |
| 0.25×8×125×4 | 9.8×25 | [16.7-（6.2+9.5）]×8.3 | 0.9×99+0.9． |