4x-x=2,x-54x-x=2x-5

解答

4 x - x = 2, x - 54 x - x = 2 x - 5

无解

求解步骤

[4 x - x = 2 x - 54 x - x = 2 x - 5]

对于

4 x - x = 2

将

x

移到一边:

x = \frac{2}{3}

替代

x = \frac{2}{3}

[\frac{2}{3} - 54 \cdot \frac{2}{3} - \frac{2}{3} = 2 \cdot \frac{2}{3} - 5]

化简

[- 36 = - \frac{11}{3}]

- 36 = - \frac{11}{3}

为假，因此方程组没有解

无解

5 a - 2 b = 11, 3 a + b = 11

3 x - 2 y = 9, \frac{x}{3} - \frac{y}{6} = \frac{5}{6}

2 x - y = 12, 3 x + y = 3

2 x + 3 y = 7, (k - 1) x + (k + 1) y = 3 k - 1

4 x + 3 y = 8, 6 x - 4 y = - 5