{x:y=2:3 y:z=6:5 x-y+z=6求此方程的解!急~
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x/2=y/3=z/5 x+3y-z/x-3y+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..
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian
如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y,
(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=?
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+y+z=6 x+2y+3z=14 y+1=z
x-y+z=-1 5x+2y-z=6 4x-3y+2z=-5
{2x+3y-4z=-5 x+y+z=6 x-y+3z=10
解方程组x+y+z=6 x+2y-3z=4 2x-y+z=5
2x+5y+4z=6,3x+y-7z=-4,x+y-z=?
x+y+z=1 4x+5y-z=6 x+2y-z=3
解方程组:x+y+z=4,x+y+2z=5,3x+y-z=6
已知2x+5y+4z=6 3x+y-7z=-4求x+y-z
已知x/4=y/5=z/6 求x+y+z/3x-2y+z的值
已知x/4=y/5=z/6,求x+y+z/3x-2y+z的值.