题目内容

7
8
+
1
2
=
1
2
+
1
3
=
1
8
-
1
9
=
3
4
-
1
2
=
1+
6
13
=
3
5
+
2
5
=
2
3
-
1
6
=
1
8
+
1
3
=
3
10
+
2
3
=
7
8
-
3
4
=
2
5
+
3
10
=
1-
11
15
=
4
7
-
1
2
=
1
4
+
1
4
=
2
7
+
1
14
=
62= 53= 0.125×8=
6.25×13= 28÷56=
分析:根据分数和小数加减乘除的计算方法进行计算.
解答:解:
7
8
+
1
2
=
11
8
1
2
+
1
3
=
5
6
1
8
-
1
9
=
1
72
3
4
-
1
2
=
1
4
1+
6
13
=1
6
13
3
5
+
2
5
=1,
2
3
-
1
6
=
1
2
1
8
+
1
3
=
11
24
3
10
+
2
3
=
29
30
7
8
-
3
4
=
1
8
2
5
+
3
10
=
7
10
1-
11
15
=
4
15
4
7
-
1
2
=
1
14
1
4
+
1
4
=
1
2
2
7
+
1
14
=
5
14
62=36, 53=125, 0.125×8=1,
6.25×13=81.25, 28÷56=0.5.
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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