题目内容
| 计算下列各题. (1)
|
(2)
|
(3)
| ||||||||||||||||
(4)
|
(5)
|
(6)
|
分析:第(1)(2)(5)题属于同分母分数的加减法计算,只把分子相加减,分母不变;
第(3)(4)(6)题属于异分母分数的加减法计算,先通分再计算.
第(3)(4)(6)题属于异分母分数的加减法计算,先通分再计算.
解答:解:(1)
+
=
=
=
;
(2)
-
=
=
=
;
(3)
+
=
+
=
;
(4)
-
=
-
=
;
(5)
+
+
=
=
;
(6)
+
-
=
+
-
=
=
.
| 7 |
| 16 |
| 7 |
| 16 |
| 7+7 |
| 16 |
| 14 |
| 16 |
| 7 |
| 8 |
(2)
| 16 |
| 21 |
| 2 |
| 21 |
| 16-2 |
| 21 |
| 14 |
| 21 |
| 2 |
| 3 |
(3)
| 9 |
| 25 |
| 4 |
| 15 |
| 27 |
| 75 |
| 20 |
| 75 |
| 47 |
| 75 |
(4)
| 7 |
| 12 |
| 3 |
| 10 |
| 35 |
| 60 |
| 18 |
| 60 |
| 17 |
| 60 |
(5)
| 5 |
| 13 |
| 6 |
| 13 |
| 4 |
| 13 |
| 5+6+4 |
| 13 |
| 15 |
| 13 |
(6)
| 3 |
| 7 |
| 1 |
| 4 |
| 11 |
| 28 |
| 12 |
| 28 |
| 7 |
| 28 |
| 11 |
| 28 |
| 8 |
| 28 |
| 2 |
| 7 |
点评:掌握同分母分数和异分母分数的计算方法,是解答此题的关键.
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