精英家教网 > 小学数学 > 题目详情
口算
5
8
+
5
8
=
11
12
-
5
12
=
4
21
+
4
21
-
1
21
=
3+
4
9
=
1
8
+
7
8
=
1-
1
6
-
5
6
=
5
16
+
3
16
+
5
16
=
4-
1
6
=
分析:根据分数加减法的计算方法进行计算即可.
解答:解:
5
8
+
5
8
=
5
4
11
12
-
5
12
=
1
2
4
21
+
4
21
-
1
21
=
1
3
3+
4
9
=3
4
9
1
8
+
7
8
=1,
1-
1
6
-
5
6
=0,
5
16
+
3
16
+
5
16
=
13
16
4-
1
6
=3
5
6
点评:口算时,注意运算符号和数据,然后再进一步计算即可.
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