题目内容
在横线里填上“>”、“<”或“=”.
3
3
1
.
| 7 |
| 9 |
>
>
| 7 |
| 10 |
| 5 |
| 15 |
<
<
| 3 |
| 8 |
| 5 |
| 8 |
>
>
| 7 |
| 12 |
| 3 |
| 7 |
>
>
| 1 |
| 3 |
| 5 |
| 8 |
>
>
| 3 |
| 10 |
| 2 |
| 5 |
<
<
| 4 |
| 7 |
3
| 1 |
| 5 |
>
>
2| 4 |
| 5 |
3
| 3 |
| 7 |
<
<
3| 12 |
| 13 |
1
| 5 |
| 9 |
<
<
1| 7 |
| 12 |
分析:分数比较大小的方法:(1)真、假分数或整数部分相同的带分数;分母相同,分子大则分数大;分子相同,则分母小的分数大;分子和分母都不相同,通分后化成同分母或者同分子的分数再进行比较大小.(2)整数部分不同的带分数,整数部分大的带分数就比较大.
解答:解:(1)
>
;
(2)
=
,
=
,
<
;
(3)
=
,
=
,
>
;
(4)
=
,
>
;
(5)
=
,
=
,
>
;
(6)
=
<
;
(7)3
>2
;
(8)3
=3
,
3
<3
;
(9)1
=1
,1
=1
,
1
<1
;
故答案为:>,<,>,>,>,<,>,<,<.
| 7 |
| 9 |
| 7 |
| 10 |
(2)
| 5 |
| 15 |
| 15 |
| 45 |
| 3 |
| 8 |
| 15 |
| 40 |
| 5 |
| 15 |
| 3 |
| 8 |
(3)
| 5 |
| 8 |
| 15 |
| 24 |
| 7 |
| 12 |
| 14 |
| 24 |
| 5 |
| 8 |
| 7 |
| 12 |
(4)
| 1 |
| 3 |
| 3 |
| 9 |
| 3 |
| 7 |
| 1 |
| 3 |
(5)
| 5 |
| 8 |
| 15 |
| 24 |
| 3 |
| 10 |
| 15 |
| 50 |
| 5 |
| 8 |
| 3 |
| 10 |
(6)
| 2 |
| 5 |
| 4 |
| 10 |
| 2 |
| 5 |
| 4 |
| 7 |
(7)3
| 1 |
| 5 |
| 4 |
| 5 |
(8)3
| 3 |
| 7 |
| 12 |
| 28 |
3
| 3 |
| 7 |
| 12 |
| 13 |
(9)1
| 5 |
| 9 |
| 20 |
| 36 |
| 7 |
| 12 |
| 21 |
| 36 |
1
| 5 |
| 9 |
| 7 |
| 12 |
故答案为:>,<,>,>,>,<,>,<,<.
点评:本题是考查分数的大小比较,当分子或分母不同时,通分时通分子还是通分母要根据具体情况而定.
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