直线｛x-y+z+5=0 5x-8y+4z+36==0的标准方程是?

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=4x-5y=y-x+6z,xyz不等0,x:y:z=? (4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=? (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian (4x-2y-z)-{5x-[8y-2z-(x+y)]-2(3y-10z)}=?好难啊 ①x+y+z=6 3x-y+2z=12 x-y-3z=-4 ②x+y-z=2 4x-2y+3y+8=0 x+3y-2z-6=0③x/3=y/2 y/4=z/5 x+y+z=60三元一次方程 怎么求空间直线L1：4x+y+3z=0,2x+3y+2z=9与L2:3X-2Y+Z=-5,X-3Y-2Z=3的位置关系? 三元一次方程组题目x+y-z=11 y+z-x=5 x-y+z=1x+y=4 y+z=3 x+z=5若已知x-3y+2z=0 2x+3y-8z=0, 且xyz≠0,则x:y:z= 3x+y=11,x+y+z+5=0,4x+3y+z=8 直线｛x-y+z+5=0 5x-8y+4z+36==0的标准方程是? 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{x-5y+2z=0 3x-5y-4z=0,求x：y:z 已知x+4y-3z=0,4x-5y+2z=0,则x：y：z 5x+4y+z=-7 4x+y-4z=-13 x+y+z=0 5x+4y+z=0 3x+y-4z=13 x+y+z=—2 5x+4y+z=0 3x+y-4z=11 x+y+z= -3 已知x,y,z,满足方程组x-2y+z=0,7x+4y-5z=0 x+y+z=51 4x+8y+5z=300 x+y+2z=67