Tìm x, y, z biết:a) 2x = 3y = 5z & x – 3y + 5z = -75b) x : y: z = 3 : 5 : (-2) & 5x – y + 3z = 124c) \(\frac{x}{3}=\frac{y}{4}\)& x – y = 10 d/ \(\frac{x}{2}=\frac{y}{3}=\frac{z}{4}\)& x – z + y = -21 e/ \(\frac{x}{10}=\frac{y}{5};\frac{y}{2}=\frac{z}{3}\)& 2x – 3y + 4z =...
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Tìm x, y, z biết:
a) 2x = 3y = 5z & x – 3y + 5z = -75
b) x : y: z = 3 : 5 : (-2) & 5x – y + 3z = 124
c) \(\frac{x}{3}=\frac{y}{4}\)& x – y = 10
d/ \(\frac{x}{2}=\frac{y}{3}=\frac{z}{4}\)& x – z + y = -21
e/ \(\frac{x}{10}=\frac{y}{5};\frac{y}{2}=\frac{z}{3}\)& 2x – 3y + 4z = 330
