问题 解答题
解方程.
3x=
1
2
1
4
x=5
4
5
x=
3
10
3
4
+x=
8
9
14
15
=
1
7
3
10
x=
4
5
答案

(1)3x=

1
2

3x÷3=

1
2
÷3

x=

1
6

(2)

1
4
x=5

1
4
x÷
1
4
=5÷
1
4

x=20;

(3)

4
5
x=
3
10

4
5
x÷
4
5
=
3
10
÷
4
5

x=

3
8

(4)

3
4
+x=
8
9

3
4
+x-
3
4
=
8
9
-
3
4

x=

5
36

(5)x÷

14
15
=
1
7

x÷

14
15
×
14
15
=
1
7
×
14
15

x=

2
15

(6)

3
10
x=
4
5

3
10
x÷
3
10
=
4
5
÷
3
10

x=2

2
3

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