题目内容
| 列竖式计算.(③⑥小题得数保留两位小数) ①4.6×1.5 |
②72×0.81 | ③9.08×1.7 |
| ④17.76÷0.6 | ⑤29.9÷0.23 | ⑥2.1÷1.3. |
分析:本题根据小数乘法与除法的运算法则列竖式计算即可.
解答:解:①4.6×1.5=6.9;
②72×0.81=58.32;
③9.08×1.7≈15.44;
④17.76÷0.6=29.6;
⑤29.9÷0.23=130;
⑥2.1÷1.3≈1.62.
|
. |
| 2 3 0 |
| 4 6 |
| 6.9 0 |
②72×0.81=58.32;
|
. |
| 7 2 |
| 5 7 6 |
| 5 8.3 2 |
③9.08×1.7≈15.44;
|
. |
| 6 3 5 6 |
| 9 0 8 |
| 1 5.4 3 6 |
④17.76÷0.6=29.6;
|
| 1 2 |
| 5 7 |
| 5 4 |
| 3 6 |
| 3 6 |
| 0 |
⑤29.9÷0.23=130;
|
| 1 3 |
| 3 9 |
| 3 9 |
| 0 |
⑥2.1÷1.3≈1.62.
|
| 1 3 |
| 8 0 |
| 7 8 |
| 2 0 |
| 1 3 |
| 7 0 |
| 6 5 |
| 5 |
点评:在按要求出近似值时,一般根据四舍五入的原则进行取值.
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