一元一次方程是指只含有一个未知数，并且未知数的最高次数为1的方程。下面是一些一元一次方程的习题：
1. 解方程：2x + 5 = 19
2. 解方程：3(x 2) = 12
3. 解方程：5x 3 = 2x + 9
4. 解方程：2(x + 3) 4 = 3x + 5
5. 解方程：x/2 + 3 = 5 x
6. 解方程：3(x 1) 2(x + 3) = 7
7. 解方程：4x 2 = 3(x + 2)
8. 解方程：2(x 1) + 3x = 11
9. 解方程：5x + 2 = 3(2x 1)
10. 解方程：x/3 + 4 = 2x 5
解答过程如下：
1. 2x + 5 = 19
2x = 19 5
2x = 14
x = 14 / 2
x = 7
2. 3(x 2) = 12
3x 6 = 12
3x = 12 + 6
3x = 18
x = 18 / 3
x = 6
3. 5x 3 = 2x + 9
5x 2x = 9 + 3
3x = 12
x = 12 / 3
x = 4
4. 2(x + 3) 4 = 3x + 5
2x + 6 4 = 3x + 5
2x + 2 = 3x + 5
2x 3x = 5 2
-x = 3
x = -3
5. x/2 + 3 = 5 x
x/2 + x = 5 3
(1/2 + 1)x = 2
(3/2)x = 2
x = 2 / (3/2)
x = 4 / 3
6. 3(x 1) 2(x + 3) = 7
3x 3 2x 6 = 7
x 9 = 7
x = 7 + 9
x = 16
7. 4x 2 = 3(x + 2)
4x 2 = 3x + 6
4x 3x = 6 + 2
x = 8
8. 2(x 1) + 3x = 11
2x 2 + 3x = 11
5x 2 = 11
5x = 11 + 2
5x = 13
x = 13 / 5
x = 2.6
9. 5x + 2 = 3(2x 1)
5x + 2 = 6x 3
5x 6x = -3 2
-x = -5
x = 5
10. x/3 + 4 = 2x 5
x/3 2x = -5 4
(1/3 2)x = -9
(-5/3)x = -9
x = -9 / (-5/3)
x = 27 / 5
x = 5.4
以上是这些一元一次方程的解答过程。希望对你有所帮助！
