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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