（中山市）每题都要有必要的计算过程．
①23×2424﹣24×2323
②52.44×79.45+159×47.56+79.55×52.44
③
④
⑤
．
竖式计算．
7.082﹣5.985
4.58×1.05
★40.8÷0.3
8.07×0.32
24.4÷7.4．
口算．
| 0.76﹣0.6= |
8.4×5= |
3.2﹣1.34﹣1.66= |
1.25×0.8= |
| 7.2÷0.072= |
12.8﹣0.28= |
3.6×0.7÷3.6×0.7= |
2.5f﹣f= |
下面各题，怎样算简便就怎样算．
6.8+0.98+0.2
43.5+43.5×99
1.25×7.2
11÷[（0.4+0.04）×0.5]．
用竖式计算
19﹣0.07=
0.63×3.6=
9.45+0.65=
5.15÷86≈（保留两位小数）
直接写得数．
| 1.4+3.6= |
0.3×0.3= |
0.49÷7= |
7.2÷100= |
| 3.6÷0.6= |
1﹣0.8÷2= |
1﹣0.7= |
4.2÷3= |
| 15×0.4= |
1÷0.25= |
0.23×0.5= |