精英家教网 > 小学数学 > 题目详情
口算:
3
7
+
2
7
=
2
5
+
1
5
=
2
10
+
2
10
=
1-
7
8
=
7
9
-
5
9
=
8
9
-
3
9
=
2
7
-
4
7
=
1-
4
6
=
分析:根据分数加减法的计算方法进行计算即可.
解答:
解:
3
7
+
2
7
=
5
7
2
5
+
1
5
=
3
5
2
10
+
2
10
=
2
5
1-
7
8
=
1
8
7
9
-
5
9
=
2
9
8
9
-
3
9
=
5
9
2
7
-
4
7
=-
2
7
1-
4
6
=
1
3
点评:口算时,注意运算符号和数据,然后再进一步解答即可.
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