题目内容

3
4
-
1
3
=
 
．
分析：异分母分数相加减，先通分化成同分母的分数，然后再计算．
解答：解：
3
4
-
1
3
=
3×3
4×3
-
1×4
4×3
=
9
12
-
4
12
=
5
12
；
故答案为：
5
12
．
点评：本题考查了分数加减法的计算，计算时要细心，注意把结果化成最简分数．
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相关题目
计算下面各题，能简算的要简算．第①②小题列竖式计算并验算．
①356-35.6=		 ②1502÷51= ③45÷[72×（
3
4
-
1
3
）]
④1.9-17.86÷9.4+19 ⑤25×32×125 ⑥9.63-（3.63+0.98）
脱式计算．
20
29
÷（50%×
6
29
÷
3
20
）；    
1
4
5
-[1÷（
3
4
+
1
3
）]×
13
9
；
2.87+5.6-0.87+4.4；                  
4.2-1.38-3.62．
{
1
2
×[4÷(3
3
5
×
5
9
)]÷
3
4
}-
1
3
．
3
4
5
-2.7=		 14×
2
7
=		  
15
16
÷5=
 1
1
3
÷
1
3
=
1
2
×
1
5
×
1
4
=		 0÷2
2
7
×9
1
5
=
 
1
3
+3÷
1
2
=		  
7
15
-
2
5
=
1
2
+
1
4
=
 4÷
2
3
=
9
14
-
9
14
=		  
3
4
+
1
3
=
7
12
×
3
14
=		 24÷
3
8
=		  
3
10
×
5
9
=
 
1
5
÷3=		 4-
2
5
=
1
5
÷3=
9
14
-
7
14
=		  
1
3
+3÷
1
2
=		 5-
3
4
=
2
3
8
×9
1
5
×0=		  
1
3
÷
1
6
=		  
1
3
×
1
4
×
1
2
=
3
10
×
5
6
=		  
1
6
×3=		  
3
8
+85+
5
8
=
4-
7
8
-
1
8
=
7
9
-
1
3
=		  
3
4
÷
1
2
=
 0.25×8= 3.4-
8
13
-
5
13
=
1
3
+0.5=
10.5-1.05=  
3
10
×
5
12
=		 10.01÷10%=
1.5×
3
5
=		  
4
5
÷80%=		  1×9÷
1
9
=
3×
1
3
÷
3
4
÷4=
直接写得数．
1
3
+
1
5
=
4
7
+
2
7
=		 2+
3
4
=
1
3
-
1
5
=
4
7
-
2
7
=
2-
3
4
=
1
2
+
2
5
=
1
2
-
2
5
=
3
4
-
1
2
=		 1-
2
5
=

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