问题 解答题
2
5
÷(
2
5
+
3
4
)

(
1
2
+
1
4
-
1
6
)×12

9
15
×
14
17
+
8
17
×
14
15

[1-(
2
3
+
1
5
1
13
7
10

(1-
1
2
-
1
4
-
1
8
-
1
16
-
1
32
-
1
64
)÷
1
64
答案

(1)

2
5
÷(
2
5
+
3
4

=

2
5
÷
23
20

=

8
23

(2)(

1
2
+
1
4
-
1
6
)×12

=

1
2
×12+
1
4
×12-
1
6
×12,

=6+3-2,

=7;

(3)

9
15
×
14
17
+
8
17
×
14
15

=

14
15
×
9
17
+
8
17
×
14
15

=(

9
17
+
8
17
)×
14
15

=1×

14
15

=

14
15

(4)[1-(

2
3
+
1
5
)×
1
13
7
10

=[1-

13
15
×
1
13
10
7

=[1-

1
15
10
7

=

14
15
×
10
7

=

4
3

(5)(1-

1
2
-
1
4
-
1
8
-
1
16
-
1
32
-
1
64
)÷
1
64

=(1-

1
2
-
1
4
-
1
8
-
1
16
-
1
32
-
1
64
)×64,

=1×64-

1
2
×64-
1
4
×64-
1
8
×64-
1
16
×64-
1
32
×64-
1
64
×64,

=64-32-16-8-4-2-1,

=1.

单项选择题
单项选择题