分数加减混合运算习题.doc: .
7
1
1 5
5 5
2 1
5
4
=
—+
+ —=
_ —
10
5
3 24
7 14
3 4
6
5 一
5
2
1 1
5 1
4
2
—
—
—+ — 二
—
——+ —— 二
=
—
+ 2 =
1 -
—=
9
5
4 5
8 3
5
7
2
5
2 5
5 1
5 1
7
1
+
+ —=
—+ —=
———
=
—
—
9
9
7 7
8 8
6 6
10
10
7
2
1
3
11
9
3
4
1
—=
—=
=
1--=
—
=
9
9
5
5
12
12
5
7
7
7
3
4
3 +
3
3
5
1 +
1
+
1
8
8 =
5
=
5
5
5 =
8
=
3
1
2
5 =
3
1
1
3
4
1
1
1
7
5
+
=
—
+ =
— =
+ =
— =
4
7
4
8
7
6
5
8
8
6
2
1
6
2
3
1
3
1
1
1
+
■ + —=
+ -=
9
2
7
3
10
4
7
9
3
5
1
1
5
1
5
1
3
14
1
+
—=
—
=
7 -
—=
—
+ =
6
4
7
5
7
5
8
15
3
3
5
1
1
3丄
4
3
丄5
7
1
+
—
一
+
—=
+ — =
——
—=
4
6
4
5
7
7
4
4
8
4
5
2
3
1
1
4
,8
12
1+
+ :
5—
9
9
7
5
6
15
15
13
7
1
1
1
4 2
1
+ 一 =
+ :
5 -=
_十一
-=
8
2
4
3
5 3
4
8 8
5
4
7
1
3
1
1
1 4
6 +
9 =
10
-5 =
5
-4 =
5-
4 =
—-一
5 5
5
7
7 1
4
3
7
-
+
+ ・:
=
2 +
—=
-=
+
12
12
8 8
9
4
3
3
8
1
3
5
1
1
1
1
1
1
_ + _ =
+
—
+
—=
+
9
6
4
16
6
5
3
4
5
6
+ -
21-
1
2 -13
=
5§
7 =
+1-二
5
5
2
4
4
8
3
1
1
1
1
1
6
2
1
—
_ ■
+
1 -
—-=
+
5
6
3
2
2
7
7
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