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。以下是一些一元一次方程的计算练习题：
1. 解方程：2x + 5 = 19
2. 解方程：3(x 4) = 9
3. 解方程：5x 2 = 3x + 7
4. 解方程：x/2 + 3 = 5
5. 解方程：2(x + 1) 3x = 5
6. 解方程：4x 8 = 2(x + 3)
7. 解方程：5x + 2 = 3(2x 1)
8. 解方程：x + 4 = 2(x 3) + 1
9. 解方程：3x 2 = 4(x + 1) 5
10. 解方程：x 3 = 2(x + 2) 4
接下来，我将给出这些方程的解答过程：
1. 2x + 5 = 19
2x = 19 5
2x = 14
x = 14 / 2
x = 7
2. 3(x 4) = 9
3x 12 = 9
3x = 9 + 12
3x = 21
x = 21 / 3
x = 7
3. 5x 2 = 3x + 7
5x 3x = 7 + 2
2x = 9
x = 9 / 2
x = 4.5
4. x/2 + 3 = 5
x/2 = 5 3
x/2 = 2
x = 2 2
x = 4
5. 2(x + 1) 3x = 5
2x + 2 3x = 5
-x + 2 = 5
-x = 5 2
-x = 3
x = -3
6. 4x 8 = 2(x + 3)
4x 8 = 2x + 6
4x 2x = 6 + 8
2x = 14
x = 14 / 2
x = 7
7. 5x + 2 = 3(2x 1)
5x + 2 = 6x 3
5x 6x = -3 2
-x = -5
x = 5
8. x + 4 = 2(x 3) + 1
x + 4 = 2x 6 + 1
x + 4 = 2x 5
x 2x = -5 4
-x = -9
x = 9
9. 3x 2 = 4(x + 1) 5
3x 2 = 4x + 4 5
3x 2 = 4x 1
3x 4x = -1 + 2
-x = 1
x = -1
10. x 3 = 2(x + 2) 4
x 3 = 2x + 4 4
x 3 = 2x
x 2x = 3
-x = 3
x = -3
以上是这些一元一次方程的解答过程。
