题目内容

直接写得数.
5
6
-
2
6
=
1
3
+
1
4
=
4
5
+
7
10
=
3
16
+
3
8
=
8
9
-
1
7
=
3
3
-
4
4
=
1
7
-
1
8
=
2
5
+
3
5
=
1-
2
3
=
5
8
-
7
12
=.
分析:(1)(8)数以同分母分数的加减法,只把分子相加减,分母不变;
(2)(3)(4)(5)(6)(7)(10)题,属于异分母分数的加减法计算,应先通分,再计算;
(9)属于整数与分数的减法计算,先把整数化为分数,再计算.
解答:解:
5
6
-
2
6
=
1
2
;                
1
3
+
1
4
=
7
12
;               
4
5
+
7
10
=
3
2
;          
3
16
+
3
8
=
9
16


8
9
-
1
7
=
47
63
;                  
3
3
-
4
4
=0;                
1
7
-
1
8
=
1
56
;            
2
5
+
3
5
=1;

1-
2
3
=
1
3
;                    
5
8
-
7
12
=
1
24
点评:此题考查了分数的加减法计算,掌握运算方法,是解题的关键.
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