方程组:x-2y+4z=0,2x+3y-3z=0...xyz不等于0,求(2x+y-z)\(2x-y+z)
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![方程组:x-2y+4z=0,2x+3y-3z=0...xyz不等于0,求(2x+y-z)\(2x-y+z)](/uploads/image/z/263878-70-8.jpg?t=%E6%96%B9%E7%A8%8B%E7%BB%84%3Ax-2y%2B4z%3D0%2C2x%2B3y-3z%3D0...xyz%E4%B8%8D%E7%AD%89%E4%BA%8E0%2C%E6%B1%82%282x%2By-z%29%5C%282x-y%2Bz%29)
方程组:x-2y+4z=0,2x+3y-3z=0...xyz不等于0,求(2x+y-z)\(2x-y+z)
方程组:x-2y+4z=0,2x+3y-3z=0...xyz不等于0,求(2x+y-z)\(2x-y+z)
方程组:x-2y+4z=0,2x+3y-3z=0...xyz不等于0,求(2x+y-z)\(2x-y+z)
由 2x+3y-3z=0 得:z-y=2x/3
(2x+y-z)/(2x-y+z)
=(2x-(z-y))/(2x+(z-y))
将 z-y=2x/3代入上式得:
(2x+y-z)/(2x-y+z)
=(2x-(2x/3))/(2x+(2x/3))
=(1-1/3)/(1+1/3)
=1/2
=0.5