x/3=y/4=z/5,xyz不等于0,则(xy-2yz+xz)/(2x^-y^+z^)的值为^是平方的意思
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![x/3=y/4=z/5,xyz不等于0,则(xy-2yz+xz)/(2x^-y^+z^)的值为^是平方的意思](/uploads/image/z/318830-14-0.jpg?t=x%2F3%3Dy%2F4%3Dz%2F5%2Cxyz%E4%B8%8D%E7%AD%89%E4%BA%8E0%2C%E5%88%99%28xy-2yz%2Bxz%29%2F%282x%5E-y%5E%2Bz%5E%29%E7%9A%84%E5%80%BC%E4%B8%BA%5E%E6%98%AF%E5%B9%B3%E6%96%B9%E7%9A%84%E6%84%8F%E6%80%9D)
x/3=y/4=z/5,xyz不等于0,则(xy-2yz+xz)/(2x^-y^+z^)的值为^是平方的意思
x/3=y/4=z/5,xyz不等于0,则(xy-2yz+xz)/(2x^-y^+z^)的值为
^是平方的意思
x/3=y/4=z/5,xyz不等于0,则(xy-2yz+xz)/(2x^-y^+z^)的值为^是平方的意思
-8/27
x/3=y/4=z/5=k
x=3k y=4k z=5k
(xy-2yz+xz)/(2x^-y^+z^)
=(3k*4k-2*4k*5k+3k*5k)/(2*9k^2-16k^2+25k^2)
=(-13k^2)/(27k^2)
=-13/27