3 x/5+3=5, x/9 =3

解答

3 \frac{x}{5} + 3 = 5, \frac{x}{9} = 3

无解

求解步骤

[3 \cdot \frac{x}{5} + 3 = 5 \frac{x}{9} = 3]

对于

3 \frac{x}{5} + 3 = 5

将

x

移到一边:

x = \frac{10}{3}

替代

x = \frac{10}{3}

[\frac{\frac{10}{3}}{9} = 3]

化简

[\frac{10}{27} = 3]

\frac{10}{27} = 3

为假，因此方程组没有解

无解

3 x - 7 y + 10 = 0, y - 3 x - 3 = 0

3 x + y = 3, 2 x + \frac{2}{3} y = 2

x - 2 y = 18, 4 x + 3 y = - 16

\frac{x}{5} + 3 = 7, x = 20

15 x - 11 y = - 87, - 12 x - 5 y = - 27