已知5x=3y,4z=7y,求x:y:z

问题描述:

已知5x=3y,4z=7y,求x:y:z

x:y:z=(3y/5):y:(7y/4)=(3/5):1:(7/4)=12:20:35已知 x+2y-z=02x+3y+z=0 求x:y