x+2y=8 2x-3y+2z=5 x+2y-Z=3

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-2z-(x-2y)]-x-(3y-10z)}=? (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian x/2=y/3=z/5 x+3y-z/x-3y+z (4x-2y-z)-{5x-[8y-2z-(x+y)]-2(3y-10z)}=?好难啊 试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y) 已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z x+Y+Z=1 X+3Y+7Z=-1 X+5Y+8Z=2x+Y+Z=1X+3Y+7Z=-1X+5Y+8Z=2 x:y=3:2 y:z=2:5 x+2y-z=8 x:y:z=3:4:5 2x-3y+2z=8 x-y-2z=? {x+y+z=1 x-2y+3z=5 2x-3y-3z=-8 x+y+z=-1 4x-2y+3z=5 y-z=8-2x {x+y+z=1 {x+3y+7z=-1 {x+5y+8z=2 X/10=Y/8=Z/9,则X+Y+Z/2Y-3Z x+y=5 2x+3y-z=9 x-y+z=4 {x+y+z=1;x+3y+7z=-1;z+5y+8z=-2 已知关于x y z的方程组2x-3y+5z=7 x+2y-3z=8,则4x+y-z= 已知:x+y+z=0,5x-3y-z=0,求:5x-y+z/2x+8y+7z 的值