已知x-y=2,y-x=2,x+z=14.求x^2-z^2

已知x、y、z满足方程组：x+y-z=6；y+z-x=2；z+x-y=0 求x、y、z的值 已知x=2,x+y+z=-2.8,求x^2(-y-z)-3.2x(z+y)的值 已知x,y,z满足方程组｛x+y-z=6{y+z-x=2{z+x_y=0,求x,y,z的值 已知 x,y,z都是正实数,且 x+y+z=xyz 证明 (y+x)/z+(y+z)/x+(z+x)/y≥2(1/x+1 已知x,y,z满足方程组{x+y-z=6,y+z-x=2,z+x-y=0,求x, 已知x+4y+z=24,2x+7y=2z=41,求x+y+z 已知x/3=y/4=z/2,求x+2y-z/x+y+z=? 已知2x=3y=4z求2x-y+z分之x+y+z的值 已知x+2y-z=8,2x-y+z=18 ,求8X+Y-Z的值 已知2x+5y+4z=6.3x+y-7z=-4 求 x+2y+z 已知 3x-y+2z=0 2x+y-3z=0,求x :y :z. 已知实数x,y,z,满足那么x+y=6,z^2=xy-9,求(x+y)^z