{x+y=5,y+z=4,z+x=3
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(x+y):(y+z):(z+x)=3:4:5 3x+y-z=-4已知(x+y):(y+z):(z+x)=3:4:5 ;3x+y-z=-4求x y z
(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=?
x+y-z=3 y+z-x=5 z+x-y=7 求x,y,z
(x+y-z)(x-y+z)=
x+y/2=z+x/3=y+z/4 x+y+z=27
x/2=y/3=z/5 x+3y-z/x-3y+z
设|x|-|y|+|z|=|x+y+z|,且|x+y|=4,|y+z|=5,|y|=3,求(x-y-z)^2的值
x+2y=3x+2z=4y+z 求x:y:z
(4x-2y-z)-{5x-[8y-2z-(x+y)]-2(3y-10z)}=?好难啊
x+y=5 2x+3y-z=9 x-y+z=4
已知3X=4X,5Y=6Z求X+Y:Y+Z
x,y,z不是0.3z=4y,z=3x求(x+y):(x+z).
已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX..
一只x/3=y/4=z/5,求x+y+z/x及x+y+z/x-y+z的值
已知:4x-5y+2z=0 x+4y-3z=0则:(x*x+y*y+z*z)/(x*y+y*z+z*x)=____.
已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
3x-2y+z=4 x+y-z=5 4x-4y+3z=27