直接寫(xiě)得數(shù).
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)數(shù)以同分母分?jǐn)?shù)的加減法,只把分子相加減,分母不變;
(2)(3)(4)(5)(6)(7)(10)題,屬于異分母分?jǐn)?shù)的加減法計(jì)算,應(yīng)先通分,再計(jì)算;
(9)屬于整數(shù)與分?jǐn)?shù)的減法計(jì)算,先把整數(shù)化為分?jǐn)?shù),再計(jì)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
點(diǎn)評(píng):此題考查了分?jǐn)?shù)的加減法計(jì)算,掌握運(yùn)算方法,是解題的關(guān)鍵.
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