题目内容
比较下列各数的大小,要求写出过程.(用“<”连接)
(1)
与
(2)
与
(3)
,
,
.
(1)
| 3 |
| 8 |
| 5 |
| 12 |
(2)
| 8 |
| 27 |
| 5 |
| 18 |
(3)
| 2 |
| 3 |
| 3 |
| 4 |
| 7 |
| 12 |
分析:本题可先将各组中的分数通分化成同分母分数后比较.
解答:解:(1)
=
,
=
,
<
,则
<
;
(2)
=
,
=
,
>
,则
<
;
(3)
=
,
=
,
<
<
,则
<
<
.
| 3 |
| 8 |
| 9 |
| 24 |
| 5 |
| 12 |
| 10 |
| 24 |
| 9 |
| 24 |
| 10 |
| 24 |
| 3 |
| 8 |
| 5 |
| 12 |
(2)
| 8 |
| 27 |
| 16 |
| 54 |
| 5 |
| 18 |
| 15 |
| 54 |
| 16 |
| 54 |
| 15 |
| 54 |
| 5 |
| 18 |
| 8 |
| 27 |
(3)
| 2 |
| 3 |
| 8 |
| 12 |
| 3 |
| 4 |
| 9 |
| 12 |
| 7 |
| 12 |
| 8 |
| 12 |
| 9 |
| 12 |
| 7 |
| 12 |
| 2 |
| 3 |
| 3 |
| 4 |
点评:本题考查了学生通过通分,将分数化成同分母分数比较大小的能力.
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