题目内容

1
3
-
1
9
=
1+
5
8
=
3
10
-
1
10
=
7
8
-
1
16
=
5
8
-
1
8
=
1-
7
8
=
1
6
+
1
12
=
3
8
-
3
8
=
7
8
-
3
8
=
1
9
-
1
10
=
4
11
+
7
11
=
1
6
+
1
4
=
分析:根据分数加减法的计算方法进行计算.
解答:解:
1
3
-
1
9
=
2
9
1+
5
8
=1
5
8
3
10
-
1
10
=
1
5
7
8
-
1
16
=
13
16
5
8
-
1
8
=
1
2
1-
7
8
=
1
8
1
6
+
1
12
=
1
4
3
8
-
3
8
=0
7
8
-
3
8
=
1
2
1
9
-
1
10
=
1
90
4
11
+
7
11
=1
1
6
+
1
4
=
5
12
点评:口算时,注意运算符号和数据,然后再进一步计算.
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