题目内容
脱式计算
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|
6-(
|
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分析:第(1)(2)(4)(5)题,属于异分母分数的加减混合运算,通分计算即可;
第(2)(6)题,先算括号内的,再算括号外的.
第(2)(6)题,先算括号内的,再算括号外的.
解答:解:(1)
-
+
,
=
-
+
,
=
;
(2)
-
+
,
=
-
+
,
=
;
(3)6-(
-
),
=6-
,
=5
;
(4)
+
+
,
=
+
+
,
=
;
(5)
+
-
,
=
+
-
,
=
;
(6)
-(
+
),
=
-
,
=
.
| 4 |
| 5 |
| 3 |
| 10 |
| 2 |
| 3 |
=
| 24 |
| 30 |
| 9 |
| 30 |
| 20 |
| 30 |
=
| 7 |
| 6 |
(2)
| 7 |
| 8 |
| 5 |
| 12 |
| 1 |
| 6 |
=
| 21 |
| 24 |
| 10 |
| 24 |
| 4 |
| 24 |
=
| 5 |
| 8 |
(3)6-(
| 3 |
| 4 |
| 2 |
| 5 |
=6-
| 7 |
| 20 |
=5
| 13 |
| 20 |
(4)
| 4 |
| 5 |
| 11 |
| 15 |
| 3 |
| 10 |
=
| 24 |
| 30 |
| 22 |
| 30 |
| 9 |
| 30 |
=
| 11 |
| 6 |
(5)
| 1 |
| 10 |
| 3 |
| 8 |
| 2 |
| 5 |
=
| 4 |
| 40 |
| 15 |
| 40 |
| 16 |
| 40 |
=
| 3 |
| 40 |
(6)
| 3 |
| 5 |
| 2 |
| 15 |
| 1 |
| 3 |
=
| 3 |
| 5 |
| 7 |
| 15 |
=
| 2 |
| 15 |
点评:此题主要考查了异分母分数的加减混合运算的方法:先通分,再计算.
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