Question

Tìm x,y,z biết :

1) \(x:y:z=3:5:\left(-2\right)\) và \(5x-y+3z=-16\)

2) \(\dfrac{x}{2}=\dfrac{y}{-3};\dfrac{z}{3}=\dfrac{y}{4}\) và \(x+y+z=5,2\)

3) \(2x=3y;7z=5y\) và \(3x-7y+5z=30\)

4) \(3x=4y=5z\) và \(x-\left(y+z\right)=-21\)

5) \(\dfrac{x-1}{2}=\dfrac{y-2}{3}=\dfrac{z-3}{4}\) và \(2x+3y-z=50\)