题目内容
(1)
-
+
.
(2)(
-
)×12.
| 5 |
| 8 |
| 2 |
| 5 |
| 3 |
| 16 |
(2)(
| 2 |
| 3 |
| 1 |
| 4 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)通分计算.
(2)先算括号内的,再算括号外的.
(2)先算括号内的,再算括号外的.
解答:
解:(1)
-
+
=
-
+
=
(2)(
-
)×12
=
×12-
×12
=8-3
=5
| 5 |
| 8 |
| 2 |
| 5 |
| 3 |
| 16 |
=
| 50 |
| 80 |
| 32 |
| 80 |
| 15 |
| 80 |
=
| 33 |
| 88 |
(2)(
| 2 |
| 3 |
| 1 |
| 4 |
=
| 2 |
| 3 |
| 1 |
| 4 |
=8-3
=5
点评:此题考查了分数的通分计算以及分数的运算顺序和运算法则.
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