题目内容
计算:
×2
=
.
| 2 |
| 9 |
| 1 |
| 4 |
| 1 |
| 2 |
| 1 |
| 2 |
分析:在计算
×2
时,先把2
化成假分数
,然后再计算.
| 2 |
| 9 |
| 1 |
| 4 |
| 1 |
| 4 |
| 9 |
| 4 |
解答:解:
×2
,
=
×
,
=
;
故答案为:
.
| 2 |
| 9 |
| 1 |
| 4 |
=
| 2 |
| 9 |
| 9 |
| 4 |
=
| 1 |
| 2 |
故答案为:
| 1 |
| 2 |
点评:在计算此题时,注意把带分数先化成假分数,在计算过程中还应注意约分.
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