题目内容

直接写出得数：
①
2
9
+
3
9
=		 ②
8
12
-
5
12
=		 ③1-
7
10
=		 ④
1
2
-
1
3
=
⑤
7
8
-
2
8
=		 ⑥4+
6
7
 ⑦
7
15
-
2
15
=		 ⑧
7
12
-
5
12
=
⑨3-
1
2
=		 ⑩
5
12
+
5
12
=
分析：利用同分母分数的加减法法则计算答案即可．
解答：
解：①
2
9
+
3
9
=
5
9
 ②
8
12
-
5
12
=
1
4
 ③1-
7
10
=
3
10
 ④
1
2
-
1
3
=
1
6
⑤
7
8
-
2
8
=
5
8
 ⑥4+
6
7
=4
6
7
 ⑦
7
15
-
2
15
=
1
3
 ⑧
7
12
-
5
12
=
1
6
⑨3-
1
2
=2
1
2
 ⑩
5
12
+
5
12
=1
点评：计算结果注意约分步化简．
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相关题目
直接写出得数：
①
2
9
+
3
9
=		 ②
8
12
-
5
12
=		 ③1-
5
6
=		 ④
1
2
+
1
3
=
⑤
7
8
-
2
8
=		 ⑥4+
6
7
=		 ⑦
3
8
-
1
4
=		 ⑧
4
5
+
1
5
=
⑨
9
10
-
1
2
=		 ⑩
2
3
+
1
4
=
（2010?泸县模拟）
直接写出得数．
2
9
×6=		 0×
3
4
=
3
4
×10=
4
9
×
3
8
=
4
7
×4=
4
7
×
3
4
=
2
3
+
3
4
=		 0.25×
2
5
=
b
a
×
c
b
=		 a×
b
a
=
1
a
-
1
b
=
1
a
+
1
b
=
2
9
×
3
2
×3=
2
9
×
5
12
×
6
5
=
直接写出得数．
2
9
÷4=		 5×
3
10
=
4
5
×
3
8
=
1
3
÷6=
7
12
+
5
6
=
9
14
×
14
15
×
5
9
=
0÷
8
9
×
7
18
=
7
9
×
1
7
=		 17-
4
8
=
4
9
×9÷
4
9
×9=
直接写出得数．
2
9
×
3
5
=
3
4
×
1
2
×
4
9
=
1
5
÷3=		 12×
3
4
=
3
8
+
5
8
-
3
8
+
5
8
=
20÷
4
9
=		 18÷
3
5
÷
2
3
=
2
3
×
7
8
=		 0×
2
13
=
4
5
×
1
4
÷
4
5
×
1
4
=
直接写出得数．
2
9
×4=
4
5
×
3
8
=		 0×
9
10
=
4
25
×50=
6
5
×
2
3
=
5
8
×
4
25
=
5
12
×
3
10
=
5
12
×
3
20
=

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