题目内容

9
10
-
7
10
=
1
4
-
1
5
=
1
4
+
1
10
=
3
5
+
2
5
=
1
9
+
1
3
=
2
3
-
1
6
=
5
8
-
3
5
=		 1-
2
5
=
9
11
+
2
11
=		 2-
8
13
=		 1.52-0.9= 1-
1
4
-
1
6
=
分析：同分母分数相加减，分母不变，分子相加减．
异分母分数相加减，先通分，变成同分母的分数相加减，再计算．
解答：解：
9
10
-
7
10
=
1
5
1
4
-
1
5
=
1
20
1
4
+
1
10
=
7
20
3
5
+
2
5
=1
1
9
+
1
3
=
4
9
2
3
-
1
6
=
1
2
5
8
-
3
5
=
1
40
 1-
2
5
=
3
5
9
11
+
2
11
=1		 2-
8
13
=1
5
13
 1.52-0.9=0.62 1-
1
4
-
1
6
=
7
12
．
点评：本题考查了简单的分数加减法的计算，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
计算下列各题，得数化成最简分数．
9
10
+
7
10
5
8
+
3
8
-
4
8
1
5
+
1
7
 1-
5
9
+
7
10
．
（2011?河西区）
直接写出得数．
910-710=		 3.6÷0.4= 0.6×0.5= 1÷0.8=
5
9
×
7
10
=
3
20
÷75%=
1
2
+
1
3
=
4
5
×8÷
4
5
=
直接写出得数
0.9+0.4=		 1.8+0.9= 1-0.3= 1.5-0.7=
3-2.6= 5.3+4.6= 4+3.5= 7-2.9=
2
10
+
5
10
=
9
10
-
5
10
=
7
10
+1=
19
100
-
7
100
=
10-9×0= 3×5×40= 3×7×4= 330÷3×10=
3
4
×4=
22
13
×
13
11
=
1
5
+
1
4
=
2
3
×
1
4
=
11
26
×
13
11
=
2
3
÷
3
4
=		 0÷
13
11
=
1
2
×
1
4
=		 0×10=
7
10
×
5
2
=
2
3
+
1
6
=
7
8
-
3
8
=		 0÷
3
4
=
7
10
÷
2
5
=
1
3
×4=
3×
2
7
+1=
1
3
+
4
9
=
9
10
-
3
5
=		 1÷（
2
9
-
1
9
）=		 4÷
1
4
×4=

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