令1/a=2/x=3/y=4/z
x=2a
y=3a
z=4a
4x^+2yz+z^/x+y-z × x-z-y/8x^+4yz+2z^
=4x^+2yz+z^/x+y-z × x-z-y/2(4x^+2yz+z^)
=(x-z-y)/[2(x+y-z)]
=(2a-4a-3a)/[2(2a+3a-4a)]
=-5/2
2/x=3/y=4/z 求4x^+2yz+z^/x+y-z 乘以 x-z-y/8x^+4yz+2z^要答案结果
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