以知1/x=3/y=5/z,求4x^2+2yz+z^2/x+y-z*x-z-y/8x^2+4yz+2z^2的值.

问题描述:

以知1/x=3/y=5/z,求4x^2+2yz+z^2/x+y-z*x-z-y/8x^2+4yz+2z^2的值.

4x^2+2yz+z^2/x+y-z*x-z-y/8x^2+4yz+2z^2是什么东东?最好重发一下题目否则只有按我的理解来做了.两种方法:1、原始方法:设1/x=3/y=5/z=1/k,则x=k,y=3k,z=5k4x^2+2yz+z^2/x+y-z*x-z-y/8x^2+4yz+2z^2=4k^2+2*3k*5k+...