一元一次方程20道例题

一元一次方程是形如ax+b=0的方程，其中a和b是常数，且a≠0。下面是20道一元一次方程的例题：

1. 解方程：2x + 5 = 9

2. 解方程：3(x 2) = 7

3. 解方程：4x 3 = 2x + 5

4. 解方程：5x 8 = 3(2x + 1)

5. 解方程：x + 4 = 2(x 3)

6. 解方程：2(x + 3) 3x = 4

7. 解方程：5x 3 = 2x + 7

8. 解方程：3x + 2 = 4x 1

9. 解方程：2(x 1) = 3(x + 2)

10. 解方程：4x 7 = 3(2x 1)

11. 解方程：x + 3 = 2(x 4)

12. 解方程：5x 8 = 3(x + 2)

13. 解方程：2x + 3 = 4x 5

14. 解方程：3(x 2) = 2x + 7

15. 解方程：x + 5 = 2(x 3)

16. 解方程：4x 2 = 3(x + 1)

17. 解方程：2(x + 3) = 3x 4

18. 解方程：5x 8 = 3(2x 1)

19. 解方程：x + 4 = 2(x 3)

20. 解方程：3x + 2 = 4x 1

以上例题的解答过程如下：

1. 2x + 5 = 9

2x = 9 5

2x = 4

x = 4 / 2

x = 2

2. 3(x 2) = 7

3x 6 = 7

3x = 7 + 6

3x = 13

x = 13 / 3

3. 4x 3 = 2x + 5

4x 2x = 5 + 3

2x = 8

x = 8 / 2

x = 4

4. 5x 8 = 3(2x + 1)

5x 8 = 6x + 3

5x 6x = 3 + 8

-x = 11

x = -11

5. x + 4 = 2(x 3)

x + 4 = 2x 6

x 2x = -6 4

-x = -10

x = 10

6. 2(x + 3) 3x = 4

2x + 6 3x = 4

-x = 4 6

-x = -2

x = 2

7. 5x 3 = 2x + 7

5x 2x = 7 + 3

3x = 10

x = 10 / 3

8. 3x + 2 = 4x 1

3x 4x = -1 2

-x = -3

x = 3

9. 2(x + 3) = 3(x + 2)

2x + 6 = 3x + 6

2x 3x = 6 6

-x = 0

x = 0

10. 4x 7 = 3(2x 1)

4x 7 = 6x 3

4x 6x = -3 + 7

-2x = 4

x = 4 / -2

x = -2

以上是20道一元一次方程的例题及其解答过程。希望对您有所帮助！