问题 解答题
X+
1
6
x=7
x:
2
5
=2:3.5
2
9
+
1
2
÷
4
5
+
3
8
8
13
÷7+
1
7
×
6
13
2-
6
13
÷
9
26
-
2
3
12
5
×(
5
6
+
3
4
)+
4
5
答案

(1)x+

1
6
x=7,

7
6
x=7,

7
6
x÷
7
6
=7÷
7
6

x=6;

(2)x:

2
5
=2:3.5,

3.5x=

2
5
×2,

3.5x=

4
5

3.5x÷3.5=

4
5
÷3.5,

x=

8
35

(3)

2
9
+
1
2
÷
4
5
+
3
8

=

2
9
+
5
8
+
3
8

=

2
9
+(
5
8
+
3
8
),

=

2
9
+1,

=1

2
9

(4)

8
13
÷7+
1
7
×
6
13

=

8
13
×
1
7
+
1
7
×
6
13

=(

8
13
+
6
13
)×
1
7

=

14
13
×
1
7

=

2
13

(5)2-

6
13
÷
9
26
-
2
3

=2-

6
13
×
26
9
-
2
3

=2-

4
3
-
2
3

=2-(

4
3
+
2
3
),

=2-2,

=0;

(6)

12
5
×(
5
6
+
3
4
)+
4
5

=

12
5
×
5
6
+
12
5
×
3
4
+
4
5

=2+

9
5
+
4
5

=2+(

9
5
+
4
5
),

=2+2

3
5

=4

3
5

多项选择题
单项选择题