题目内容

3
5
+3=
14
15
-
11
15
=
5
9
+
7
9
=
5
7
-
5
7
=
7
8
-
1
8
=
4
21
+
17
21
=
3
5
-
2
5
=		 1-
4
7
=
1
6
+
5
6
-1=		 1-
9
14
-
3
14
=
7
13
+
6
13
+1=
4
11
-
2
11
=
分析：根据分数加减法的计算方法进行计算即可得到答案．
解答：解：
3
5
+3=3
3
5
14
15
-
11
15
=
1
5
5
9
+
7
9
=1
1
3
5
7
-
5
7
=0
7
8
-
1
8
=
3
4
4
21
+
17
21
=1
3
5
-
2
5
=
1
5
 1-
4
7
=
3
7
1
6
+
5
6
-1=0		 1-
9
14
-
3
14
=
1
7
7
13
+
6
13
+1=2
4
11
-
2
11
=
2
11
．
点评：此题主要考查的是分数加减法计算方法的应用．
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相关题目
计算下面各题，注意使用简便算法．
9
10
÷
7
4
+
3
7
×
9
10
 (
14
15
-
5
9
-
1
5
)×45
6
7
+
7
9
×
3
2
+
5
6
3÷
3
5
-
3
5
÷3		 6÷
1
5
÷
3
5
÷5		 [
5
6
-(
2
5
+
1
3
)]×
5
7
5
11
×
1
2
÷
5
11
×
1
2
3
4
÷8+
3
4
÷
8
7
8
15
×
7
9
-
7
15
×
7
9
．
用递等式计算．
5.25×3.6+6
2
5
×5
1
4
                     		  8
4
5
+5.25+1.2+
23
4
2
2
5
×[3.8÷(3-2.4×
14
15
)]		 5.13×
3
5
-4.63×0.6
[1-(
1
4
+
3
8
)]÷
1
4
 5-
7
8
×
40
49
-
2
7
．
直接写出得数．
30-29.02=
1
5
+
1
3
=		 0.4×0.4= 36
1
3
+7.5-36
1
3
+7.5=
1÷0.1-1÷0.1=
3
5
÷
1
10
=
14
15
×
5
7
=		 99.99×3.7258×0=
直接写出得数．
1-40%=
3
8
+3=
14
15
÷7=
1
6
×
3
8
=
3
4
×8=
2
3
÷2=
9
10
÷
3
5
=
1
3
×9×
2
3
=
5
6
-
1
2
=		 4.5+
1
2
=		 6.8÷10%=
3
10
×
5
12
=

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