题目内容
混合运算
-
+
+(
-
)
1-
+
-(
+
).
4 |
5 |
3 |
4 |
1 |
2 |
1 |
3 |
7 |
12 |
1 |
6 |
1-
1 |
5 |
2 |
3 |
5 |
6 |
3 |
4 |
1 |
12 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:首先通分,然后根据分数四则混合运算的运算方法计算即可.
解答:
解:(1)
-
+
=
-
+
=
(2)
+(
-
)
=
+(
-
)
=
+
=
(3)1-
+
=
+
=
+
=1
(4)
-(
+
)
=
-(
+
)
=
-
=0
4 |
5 |
3 |
4 |
1 |
2 |
=
16 |
20 |
15 |
20 |
10 |
20 |
=
11 |
20 |
(2)
1 |
3 |
7 |
12 |
1 |
6 |
=
4 |
12 |
7 |
12 |
2 |
12 |
=
4 |
12 |
5 |
12 |
=
3 |
4 |
(3)1-
1 |
5 |
2 |
3 |
=
4 |
5 |
2 |
3 |
=
12 |
15 |
10 |
15 |
=1
7 |
15 |
(4)
5 |
6 |
3 |
4 |
1 |
12 |
=
10 |
12 |
9 |
12 |
1 |
12 |
=
10 |
12 |
10 |
12 |
=0
点评:此题主要考查了分数四则混合运算的运算方法的应用.
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