已知X+1/Y=1,Y+1/2Z=1,求Z+1/2X的值
问题描述:
已知X+1/Y=1,Y+1/2Z=1,求Z+1/2X的值
。
答
1/2
x=1-1/y
z=1/2(1-y)
z+1/2x=1/2(1-y)+y/2(y-1)=1/2[1/(1-y)+y/(y-1)]=1/2