题目内容

7
9
-
4
9
=
2
9
2
9
3
8
+
5
8
=
1
1
1
2
-
1
2
=
0
0
1
3
-
1
4
=
1
12
1
12
3+
5
6
=
3
5
6
3
5
6
5-
7
11
=
4
4
11
4
4
11
5
7
+
2
7
=
1
1
5
6
-
3
12
=
7
12
7
12
1
3
+
1
6
=
1
2
1
2
2.2+6.8=
9
9
0.79-0.32=
0.47
0.47
1-
5
8
=
3
8
3
8
分析:横向数:(1)(3)(4)(8)依据分数减法计算方法解答,
(2)(7)(9)依据分数加法计算方法解答,
(5)(6)(12)依据整数加或减分数计算方法解答,
(10)(11)依据小数加减法计算方法解答.
解答:
解:
7
9
-
4
9
=
1
3
3
8
+
5
8
=1;
1
2
-
1
2
=0;
1
3
-
1
4
=
1
12
3+
5
6
=3
5
6
5-
7
11
=4
4
11
5
7
+
2
7
=1;
5
6
-
3
12
=
7
12
1
3
+
1
6
=
1
2
2.2+6.8=9; 0.79-0.32=0.47; 1-
5
8
=
3
8
点评:本题主要考查学生依据分数、小数加减法计算方法解决问题的能力.
练习册系列答案
相关题目

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网