解方程:x :y=2 :3 x :y= 2 :3 x :z =5 :4 x+y+z=33

解方程：{2x+3y+z=7,x+y+z=4,3x+y-z=-4 解方程{3x -y+z=4 2x+3y-z=12 x+y+z=6 解方程一;{x+y-z=6,x-3y+2z=1,3x+2y-z=-7.②{3x+4z=7,2x+3y+z=9,5x-9y x/2=y/3=z/5 x+3y-z/x-3y+z 试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y) 3x-y+z=3 2x+y-3z=11 x+y+z=12 解方程 解方程:x+2y+3z=8 x+3y+5z=6 已知2x+3y+z=130,3x+5y+z=180,试求x+2y/z+y+z【在线等高手解方程】 (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai 解方程组：x+y+z=4,x+y+2z=5,3x+y-z=6 三元方程求救要过程2x+3y+z=383x+4y+2z=564x+5y+z=66x:y=5:3x:z=7:32x-y-z 已知x,y,z,同时满足方程x+3y-5z=0,2x-y-3z=0求x：y：z的值