｜x-12｜+｜x+y-25｜+z²-10z+25=0 则以x、y、z、为三边的三角形是（）三角形

解方程 x(x+y+z)=6 y(x+y+z)=12 z(x+y+z)=18 解方程组{x(x+y+z)=6,y(x+y+z)=12,z(x+y+z)=18 x+y=8 y+z=12 x+z=10 x+y+z= x+y=8 y+z=12 x+z=10 x+y+z= x-y/(z-x)(z-y) 一y-z/(x-y)(x-z) ＋z-x/(y-z)(y-x) x^-(y-z)^/(x+y)^-z^ 计算（x+y-z)(x-y-z) 计算：(x-y+z)(-x+y+z) (x+y-z)(x-y+z)= 因式分解：25x y^2 z^2 (x+y-z)-30xyz(z-x-y)^2+5x y z^3 (z-x-y) x+y+z=12 x-y+z=2 x-z+y+a=90 x+y+a+z=100,求x y z a X=3z X+y+z=12 X+2y-2z=10 如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y, x^2(y-z)+x(z-y)+12(z-y)因式分解解答过程 x=y/z=z/3,x+y+z ＝12,求2x+3y+4z是多少, x y y ...y z x y ...y z z x ...y ........z z z ...x 求解行列式. x+y>z 0 用乘法公式计算(x+y)(x-y)+(-y-z)(-y+z)+(-x+z)(z+x)