题目内容

直接写出得数
1-
7
9
=
3
4
+
3
8
=
7
15
-
2
5
=
1
2
+
1
7
=
5
8
-
1
4
=
1
4
+
1
3
=
9-
1
9
=
1-
1
4
-
1
8
=
6
2
3
-4
1
3
=
0.13=
5
9
-
1
3
=
1
2
+
2
3
-
1
2
+
2
3
=
1
1
5
+0.8=
2-
5
8
-
3
8
=
4
11
+
1
5
+
7
11
=
4
5
+
1
12
-
4
5
=
考点:分数的加法和减法
专题:运算顺序及法则
分析:直接利用分数加减法的计算方法算出结果即可.
解答:
解:1-
7
9
=
2
9
3
4
+
3
8
=
9
8
7
15
-
2
5
=
1
15
1
2
+
1
7
=
9
14
5
8
-
1
4
=
3
8
1
4
+
1
3
=
7
12
9-
1
9
=8
8
9
1-
1
4
-
1
8
=
5
8
6
2
3
-4
1
3
=2
1
3
0.13=0.001
5
9
-
1
3
=
2
9
1
2
+
2
3
-
1
2
+
2
3
=
4
3
1
1
5
+0.8=2
2-
5
8
-
3
8
=1
4
11
+
1
5
+
7
11
=1
1
5
4
5
+
1
12
-
4
5
=
1
12
点评:此题考查分数加减法的计算法则,注意计算结果的化简.
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