题目内容

口算:
1
9
+
5
9
=
7
11
-
7
11
=
1
2
+3=
2.6-1
3
5
=
5-
8
11
=
1
5
-
1
6
=
11
14
+
9
14
=
5
12
-
1
12
=
2-
1
3
-
2
3
=
2
3
+
1
7
-
2
3
=
1
2
7
-(
2
7
+
1
8
)=
3
4
+
3
8
+
3
4
+
5
8
=
分析:根据分数加法、减法的计算法则进行计算即可,要注意分析式中数据,能简算的要简算.
解答:解:
1
9
+
5
9
=
2
3
7
11
-
7
11
=0
1
2
+3=3
1
2
2.6-1
3
5
=1
5-
8
11
=4
3
11
1
5
-
1
6
=
1
30
11
14
+
9
14
=
10
7
5
12
-
1
12
=
1
3
2-
1
3
-
2
3
=1
2
3
+
1
7
-
2
3
=
1
7
1
2
7
-(
2
7
+
1
8
)=
7
8
3
4
+
3
8
+
3
4
+
5
8
=2
1
2
点评:在计算分数加减法时要注意通分、约分,结果要化为最简分数.
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