x+y=3 y+z=5 x+z=6
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x+y-z=3 y+z-x=5 z+x-y=7 求x,y,z
(x+y-z)(x-y+z)=
x/2=y/3=z/5 x+3y-z/x-3y+z
6x+5y+3z=100 x+y+z=30 求 x y
已知3X=4X,5Y=6Z求X+Y:Y+Z
若X:Y:Z=5:6:7那么(Y-X):(Y+Z)和(X+2Y+3Z):(3X+2Y+Z)
已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX..
x+y+z=6 x+2y+3z=14 y+1=z
解方程组3x+y+z=6,x+3y+z=5,x+y+3z=9{3x+y+z=6{x+3y+z=5{x+y+3z=9
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)
x/3=y/6=z/8 3x+5y-6z=-18 求x,y,z
y+z-3x=3z+x-3y=5x+y-3z=6
3x+y+z=6 x+3y+z=5 x+y+3z=9
x-y+z=-1 5x+2y-z=6 4x-3y+2z=-5
{2x+3y-4z=-5 x+y+z=6 x-y+3z=10
2x+5y+4z=6,3x+y-7z=-4,x+y-z=?
x+y+z=1 4x+5y-z=6 x+2y-z=3