精英家教网 > 小学数学 > 题目详情
口算
1
2
-
1
3
=
8
21
+8+
8
21
=
6
5
-
4
5
+
1
5
=
1
3
+
1
4
=
3-
1
5
-
4
5
=
3-
1
4
+
1
4
=
1
2
+
1
5
=
1-
5
8
-
1
8
=
1+
1
12
+
1
3
=
分析:根据分数加减法的计算方法进行计算.
8
21
+8+
8
21
根据加法交换律进行计算;
3-
1
5
-
4
5
,1-
5
8
-
1
8
根据连减的性质进行计算.
解答:解:
1
2
-
1
3
=
1
6
8
21
+8+
8
21
=8
16
21
6
5
-
4
5
+
1
5
=
3
5
1
3
+
1
4
=
7
12
3-
1
5
-
4
5
=2,
3-
1
4
+
1
4
=3,
1
2
+
1
5
=
7
10
1-
5
8
-
1
8
=
1
4
1+
1
12
+
1
3
=1
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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