问题 解答题
解下列方程.
6x+
1
2
x=9
1
4
x+20%x=
13
20

5
8
=
1
12

6
7
×
9
14
=
3
4
答案

(1)6x+

1
2
x=9,

13
2
x=9,

13
2
2
13
=9×
2
13

x=1

5
13

(2)

1
4
x+20%x=
13
20

1
4
x+
1
5
x=
13
20

9
20
x=
13
20

9
20
20
9
=
13
20
×
20
9

x=

13
9

x=1

4
9

(3)x÷

5
8
=
1
12

8
5
×
5
8
=
1
12
×
5
8

x=

5
96

(4)x÷

6
7
×
9
14
=
3
4

7
6
×
9
14
=
3
4

3
4
×
4
3
=
3
4
×
4
3

x=1.

判断题
判断题