题目内容
把不同分母的分数化成相同分母的分数后再相加减.

分析:利用异分母分数的加减法的计算方法:异分母分数相加减,先通分,再按同分母分数加减法计算;由此方法计算即可.
解答:解:
+
=
+
=
;
-
=
-
=
;
+
=
+
=
;
-
=
-
=
;
-
=
-
=
;
+
=
+
=
.
| 1 |
| 6 |
| 3 |
| 4 |
=
| 2 |
| 12 |
| 9 |
| 12 |
=
| 11 |
| 12 |
| 6 |
| 7 |
| 2 |
| 3 |
=
| 18 |
| 21 |
| 14 |
| 21 |
=
| 4 |
| 21 |
| 4 |
| 9 |
| 5 |
| 6 |
=
| 8 |
| 18 |
| 15 |
| 18 |
=
| 23 |
| 18 |
| 7 |
| 12 |
| 1 |
| 8 |
=
| 14 |
| 24 |
| 3 |
| 24 |
=
| 11 |
| 24 |
| 4 |
| 5 |
| 1 |
| 6 |
=
| 24 |
| 30 |
| 5 |
| 30 |
=
| 19 |
| 30 |
| 2 |
| 3 |
| 3 |
| 4 |
=
| 8 |
| 12 |
| 9 |
| 12 |
=
| 17 |
| 12 |
点评:此题考查异分母分数的加减法法则:异分母分数相加减,先通分,再按同分母分数加减法计算.
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