1.已知3x=2y=5z≠0.求x+2y+3y/x-y+z的值.
问题描述:
1.已知3x=2y=5z≠0.求x+2y+3y/x-y+z的值.
答
设3x=2y=5z=K
则X=K/3,Y=K/2,Z=K/5
x+2y+3y/x-y+z=(K/3+K+3K/5)/(K/3-K/2+K/5)=58