已知x-4y-z=0,2x+y-8z=0,且xyz不全为0,求x:y:z的值?的值?求代数xy+yz+zx分之x²+2xy+z²的值?
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已知:x^2/(z+y)+y^2/(x+z)+z^2/(x+y)=0,求x/(z+y)+y/(x+z)+z/(x+y)的值.
已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX..
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已知x>0 y>0 z>0 求证 (y/x+z/x)(x/Y+z/y)(x/z+y/z)>=8如题.
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已知2x-y-z=0,3x+4y-2z=0,则x:y:z=?
已知x-2y+3z=0,x-3y+4z=0,则x:y:z=
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