解x+y-z=11 y+2-x=5 x-y+z=119点30之前啊

{x+y-z=11 y+z-x=5 z+x-y=1 {x+y-z=11,x-y-z=-5,x-y+z=1 解三元一次方程组：(1)x+2y+3z=11x-y+4z=10x+3y+2z=2(2)x:y=3:5y:z=5:6x+y+2z=40(3)x+y-z=2y+z-x=4z+x-y=6谢谢! x/2=y/3=z/5 x+3y-z/x-3y+z 解三元一次方程 (1) x-2y=1 (2) x+y-z=11 x=3y y+z-x=5 x-3y+z=8 z+x-y=1..... 解三元一次方程 (1) x-2y=1 (2) x+y-z=11 x=3y y+z-x=5 x-3y+z=8 z+x-y=1 解x+y-z=11 y+2-x=5 x-y+z=119点30之前啊 解三元一次方程,①{x+y-z=0{ x+2y+z=13{2x-3y+2z=5②｛x+y-z=11｛y+z-x=5｛z+x-y=1③｛x+y=1｛y+z=6｛z+x=3 (x+y-z)(x-y+z)= 用行列式的性质证明：y+z z+x x+y x y z x+y y+z z+x =2 z x y z+x x+y y+z y z x 这个怎么证? 已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX.. 解三元一次的方程 x+y-z=11 y+z-x=5 z+x-y=1 解方程 .{x+y-z=11 {y+z-x=5 {z+x-y=1 方程组x+y-z=11 y+z-x=5 z+x-y=1的解 解方程组{2x+3y+z=11,x+y+z=0,3x-y+z=-2. 3x-y+z=3 2x+y-3z=11 x+y+z=12 解方程 怎样解三元一次方程组(1)x+y-z=11,y+z-x-5,z+x-y=1 解方程组 z=x+y 2x-3y+2z=5 x+2y-z=3