题目内容

计算下面各题.
1
9
+
4
9
=
7
10
+
3
10
=
1
8
+
2
8
=
3
7
-
2
7
=
1-
1
9
=
7
8
-
2
8
=
3
5
+
2
5
=
4
6
-
3
6
=
8
10
-
5
10
=
分析:同分母分数加减法的计算方法:分母不变,分子相加减.
解答:
解:
1
9
+
4
9
=
1+4
9
=
5
9
           
7
10
+
3
10
=
7+3
10
=1
       
1
8
+
2
8
=
1+2
8
=
3
8
        
3
7
-
2
7
=
3-2
7
=
1
7
 
1-
1
9
=
9
9
-
1
9
=
9-1
9
=
8
9
    
7
8
-
2
8
=
7-2
8
=
5
8
        
3
5
+
2
5
=
3+2
5
=1
       
4
6
-
3
6
=
4-3
6
=
1
6

8
10
-
5
10
=
8-5
10
=
3
10
点评:本题主要考查了同分母分数加减法的计算方法.
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