题目内容
计算,得数要约成最简分数
+
=
-
=
-
=
+
=
| 3 |
| 10 |
| 5 |
| 10 |
| 9 |
| 16 |
| 7 |
| 16 |
| 7 |
| 8 |
| 1 |
| 8 |
| 11 |
| 21 |
| 10 |
| 21 |
分析:本题按照同分母分数相加减的计算方法求解.
解答:解:(1)
+
,
=
,
=
,
=
;
(2)
-
,
=
,
=
,
=
;
(3)
-
,
=
,
=
,
=
;
(4)
+
,
=
,
=
;
=1.
| 3 |
| 10 |
| 5 |
| 10 |
=
| 3+5 |
| 10 |
=
| 8 |
| 10 |
=
| 4 |
| 5 |
(2)
| 9 |
| 16 |
| 7 |
| 16 |
=
| 9-7 |
| 16 |
=
| 2 |
| 16 |
=
| 1 |
| 8 |
(3)
| 7 |
| 8 |
| 1 |
| 8 |
=
| 7-1 |
| 8 |
=
| 6 |
| 8 |
=
| 3 |
| 4 |
(4)
| 11 |
| 21 |
| 10 |
| 21 |
=
| 11+10 |
| 21 |
=
| 21 |
| 21 |
=1.
点评:本题考查了同分母分数相加减的方法:分母不变分子相加减,然后把运算结果化成最简分数.
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