2x+y+z=17 2y+x+z=17 2z+x+y=17 怎么算?

方程组：{x+y-z=6,x+z=16,x-y+2z=17 方程组x+3y-z=17 2x-y+z=16中的y、z同时满足y=z+2,求x、y、z.急! 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? (x-2y+z)(x+y-2z)分之（y-x)(z-x) + (x+y-2z)(y+z-2x)分之(z-y)(x-y) + (y+z-2z)(x-2y+z)分之（x-z)(y-z)=?第三部分那个是 （y+z-2x)(x-2y+z)分之（x-z)(y-z) 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 已知：x^2/(z+y)+y^2/(x+z)+z^2/(x+y)=0,求x/(z+y)+y/(x+z)+z/(x+y)的值. x^2/(z+y)+y^2/(x+z)+z^2/(x+y)=0,求x/(z+y)+y/(x+z)+z/(x+y)的值 2x+y+z=17 2y+x+z=17 2z+x+y=17 怎么算? 2x+y+z=15 x+2y+z=16 x+y+2z=17 2x+y+z=17 x+2z+y=14 x+z+2y=13 求:xyz x+2y+4z=17 2x+y+z=7 3x+y+2z=11 解方程组:2x+y+z=15 x+2y+z=16 x+y+z=17 2x-3y-z=-6 7x-y+2z=-17 x-y+z=-6 2x-y+2z=-17 3x+y-3z=-4 x+y+z=6 2x-y+2z=-17 3x+y-3z=-4 x+y+z=6 解方程 x+y+z=10,x+3y+2z=17,y-x+3z=8 x-y=1 x+z=2 z-y=17x-y=1(1)x+z=2(2) z-y=17(3)