Tìm x,y,z khi:
1,\(\frac{x}{7}=\frac{y}{3}vàx-24=y\)
2,\(\frac{x}{5}=\frac{y}{7}=\frac{z}{2}và,y-x=48\)
3,\(\frac{x-1}{2005}=\frac{3-y}{2006}và,x-y=4009\)
4,\(\frac{x}{2}=\frac{y}{3};\frac{y}{4}=\frac{z}{5}vã-y-z=28\)
5,\(\frac{x}{3}=\frac{y}{5}=\frac{z}{7}và2x+3y-z=-14\)
6,\(3x=y;5y=4zvà6x+7y+8z\)