若x-4y+5z=2,5x+4y+z=4,则x+y=
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若x/2=y/3=z/4,则3x-2y+5z/x+y+z=
若4x=7y+5z,2x+y=z,则x:y:z的值为
若x/3=y/4=z/5,求x+y+z/3x-2y+z的值.
若xyz≠0且4(x/z)-5(y/z)=-2,(x/z)+4(y/z)=3,求x:y:z
(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=?
已知x::y:z=3:4:5,(1)求x+y分之z的值;(2)若x+y+z=6,求x,y,z.
若x,y,z成等差数列,则(z-x)^2-4(x-y)(y-z)=
设|x|-|y|+|z|=|x+y+z|,且|x+y|=4,|y+z|=5,|y|=3,求(x-y-z)^2的值
(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
{x+y+z=12 x+2y+5z=22 x=4y
(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
已知XY=2(X+Y),YZ=4(Y+Z),ZX=5(Z+X),求X,Y,Z已知XY=2(X+Y),YZ=4(Y+Z),ZX=5(Z+X),求X,Y,Z
已知:4x-5y+2z=0 x+4y-3z=0则:(x*x+y*y+z*z)/(x*y+y*z+z*x)=____.
1.若3x-2y+z=2;3x+2y+5z=4,求x+22.若x-3y+z=0;3x-3y-4z=0,求x:y:z
x+y+z=4,x+2y-z=4,3x-y+4z=5
3x-2y+z=4 x+y-z=5 4x-4y+3z=27
2x+5y+4z=6,3x+y-7z=-4,x+y-z=?