作业帮已知X+4Y-3Z=0,4X-5Y+2Z=0(XYZ≠0),求（3x²+2xy+z²）/(x²+y²)的值,
来源：学生作业帮助网 编辑：作业帮 时间：2024/07/12 23:45:23
xPJ@ yL$Ic& A7RmTEucH~vRwo{9sϹʏS/SF+UAUZe
ţf".6hn}"ZXyfld UcߵWVTe• JJ0!ID`rzCSF7 eϨ S#搴*2 ȳ7˸E?/=- 9v6=rr7<0q*G $kDPߍf~ocRE+B>[{dɲK=?q]G[KX QYkYd__?q
已知X+4Y-3Z=0,4X-5Y+2Z=0(XYZ≠0),求（3x²+2xy+z²）/(x²+y²)的值,
已知X+4Y-3Z=0,4X-5Y+2Z=0(XYZ≠0),求（3x²+2xy+z²）/(x²+y²)的值,
已知X+4Y-3Z=0,4X-5Y+2Z=0(XYZ≠0),求（3x²+2xy+z²）/(x²+y²)的值,
X+4Y-3Z=0 (1)
4X-5Y+2Z=0 (2)
(1)*4-(2),得：3Y=2Z
(1)*2-(2)*3,得：2X=Y
把Z=3/2 Y,X=1/2 Y 带入式（3x²+2xy+z²）/(x²+y²),解得为16/9
X+4Y-3Z=0和4X-5Y+2Z=0把Y当作常数来解出X,Z
X-3Z＝4Y，4X+2Z＝5Y。解得：X=14Y/16,Z=－11Y/16
代入算式：（3x²+2xy+z²）/(x²+y²)约去y就是：3(14/16)^2+2*14/16+(11/16)^2/[(14/16)^2+1]
已知x+4y-3z=0,4x-5y+2z=0,则x：y：z
已知{x-5y+2z=0 3x-5y-4z=0,求x：y:z
已知方程组4x-5y+2z=0 x+2y=3z 则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)=____.
已知3x+4y+5z=0,2x+3y-4z=0,求(x+y+z)/(x-y+z)
已知2x+3y-4z=0,3x+4y+5z=0,求x+y+z/（除以）x-y+z的值.
已知{3x+4y+5z=0,2x+3y-4z=0,求x+y+z/x-y+z的值.
已知4x-3y-6z=0,x+2y-7z=0,求5x+2y-z/2x-3y-10z
已知2x+3y-4z=0,3x+4y-5z=0.求x+y+z除以x-y+z,
已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值
已知x+4y-3z=0；4x-5y+2z=0,则3y-5z分之2x-y+3z=?
已知{x+4y-3z=0,4x-5y+2z=0,则2x-y+3z分之3y-5z=?
已知x,y,z满足方程组x-2y+z=0 7x+4y-5z=0,且z不等于0,2x²-3y²+z²/y²-2z²的值为?
已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX..
已知2x+3y-4z=0,3x+3y+5z=0,求x+y+x/x-y+z的值
已知x,y,z满足方程组：4x-5y+2z=o;x+4y-3x=0,求x:y:z的值
已知{x-3y+2z=0 3x-3y-4z+0,则x:y:z=?
已知x-2y+3z=0,x-3y+4z=0,则x:y:z=