题目内容
在横线里填“>”、“<”或“=”.
(1)
-
-
(2)
+
+
(3)
+
+
(4)
-
+
.
(1)
| 5 |
| 8 |
| 3 |
| 8 |
>
>
| 7 |
| 12 |
| 5 |
| 12 |
(2)
| 4 |
| 11 |
| 3 |
| 11 |
<
<
| 2 |
| 9 |
| 5 |
| 9 |
(3)
| 4 |
| 7 |
| 3 |
| 7 |
=
=
| 5 |
| 9 |
| 4 |
| 9 |
(4)
| 4 |
| 5 |
| 1 |
| 5 |
>
>
| 1 |
| 10 |
| 1 |
| 10 |
分析:根据同分母分数加减法的计算方法分别求出各自的结果,然后再根据分数大小比较的方法进行解答.
解答:解:
(1)
-
=
,
-
=
,
>
;
所以,
-
>
-
;
(2)
+
=
,
+
=
,
<
;
所以,
+
<
+
;
(3)
+
=1,
+
=1;
所以,
+
=
+
;
(4)
-
=
,
+
=
,
>
;
所以,
-
>
+
.
故答案为:>,<,=,>.
(1)
| 5 |
| 8 |
| 3 |
| 8 |
| 1 |
| 4 |
| 7 |
| 12 |
| 5 |
| 12 |
| 1 |
| 6 |
| 1 |
| 4 |
| 1 |
| 6 |
所以,
| 5 |
| 8 |
| 3 |
| 8 |
| 7 |
| 12 |
| 5 |
| 12 |
(2)
| 4 |
| 11 |
| 3 |
| 11 |
| 7 |
| 11 |
| 2 |
| 9 |
| 5 |
| 9 |
| 7 |
| 9 |
| 7 |
| 11 |
| 7 |
| 9 |
所以,
| 4 |
| 11 |
| 3 |
| 11 |
| 2 |
| 9 |
| 5 |
| 9 |
(3)
| 4 |
| 7 |
| 3 |
| 7 |
| 5 |
| 9 |
| 4 |
| 9 |
所以,
| 4 |
| 7 |
| 3 |
| 7 |
| 5 |
| 9 |
| 4 |
| 9 |
(4)
| 4 |
| 5 |
| 1 |
| 5 |
| 3 |
| 5 |
| 1 |
| 10 |
| 1 |
| 10 |
| 1 |
| 5 |
| 3 |
| 5 |
| 1 |
| 5 |
所以,
| 4 |
| 5 |
| 1 |
| 5 |
| 1 |
| 10 |
| 1 |
| 10 |
故答案为:>,<,=,>.
点评:关键是求出各自的结果,然后再进行比较大小.
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