已知x+2y+3z=10,4x+3y+2z=负15 求x+y+z的值.

已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z 已知4x-3y-6z=0,x+2y-7z=0,求5x+2y-z/2x-3y-10z 已知,方程组:4x-3y-7z=0 x+2y=10z 则(x-y+z)÷(x+y+z)=—— (4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=? 已知x/2=y/3=z/4,则2x+y-z/3x-2y+z=? 已知(x+2y)/2=(y+3z)/3=(z+4x)/4,则x:y:z=? 已知{x-3y+2z=0 3x-3y-4z+0,则x:y:z=? 已知(x+2y)/3=(y+3z)/4=(z+5x)/5,则x:y:z= 已知x+2y/3=y+3z/4=z+5x/5,则x:y:z=? 已知x+2y/3=y+3z/4=z+5x/5,则x:y:z= 已知x-2y+3z=0,x-3y+4z=0,则x:y:z= 已知2x-y-z=0,3x+4y-2z=0,则x：y：z=? 已知x/3=y/4=z/2,求x+2y-z/x+y+z=? 已知X:Y:Z=3:4:5,求4X+3Y-2Z/X+Y+Z的值 已知方程组4x-5y+2z=0 x+2y=3z 则x:y:z 已知2x+5y+4z=6 3x+y-7z=-4求x+y-z 已知x+4y-3z=0,4x-5y+2z=0,则x：y：z 已知x+4y=3z,4x-5y=-2z,则x:y:z