题目内容
口算下面各题.
(1)
+
=
(2)
-
=
(3)
-
=
(4)1-
=
(1)
| 5 |
| 6 |
| 5 |
| 6 |
(2)
| 4 |
| 7 |
| 5 |
| 14 |
(3)
| 3 |
| 5 |
| 3 |
| 8 |
(4)1-
| 17 |
| 33 |
分析:本题根据分数加减法的运算法则计算即可:同分母分数相加减,分数的分子相加减,分母不变,异分母分数相加减,要先进行通分,将异分母分数化为同分母分数后,再按同分母分数相加减的法则进行计算.
解答:解:(1)
+
=
;
(2)
-
=
;
(3)
-
=
;
(4)1-
=
.
| 5 |
| 6 |
| 5 |
| 6 |
| 5 |
| 3 |
(2)
| 4 |
| 7 |
| 5 |
| 14 |
| 3 |
| 14 |
(3)
| 3 |
| 5 |
| 3 |
| 8 |
| 9 |
| 40 |
(4)1-
| 17 |
| 33 |
| 16 |
| 33 |
点评:结果是分数的要注意将结果化为最简分数.
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