问题 解答题
7
10
+(
4
7
+
1
2
)×
7
25
[1-(
1
4
+
3
8
)]÷
1
4
12
5
×(
5
6
+
3
4
)+
4
5
1
7
÷2
2
3
+
6
7
×
3
8
答案

(1)
7
10
+(
4
7
+
1
2
)×
7
25

=

7
10
+
15
14
×
7
25

=

7
10
+
3
10

=1;

(2)[1-(
1
4
+
3
8
)]÷
1
4

=[1-

7
8
1
4

=

1
8
×4,

=

1
2

(3)

12
5
×(
5
6
+
3
4
)+
4
5

=

12
5
×
19
12
+
4
5

=

19
5
+
4
5

=

23
5

(4)

1
7
÷2
2
3
+
6
7
×
3
8

=

1
7
×
3
8
+
6
7
×
3
8

=(

1
7
+
6
7
)×
3
8

=1×

3
8

=

3
8

单项选择题 A1/A2型题
判断题