求解（x+2y+3z)*(x+2y-3z)要步骤

2x+3y+z=11,x+y+z=6,3x-y-z=-2求解 2x+3y+z=11,3x+y-z=2,x+y+z=6求解 x-y+z=0,2x+y-2z=6,3x-y-z=3求解, 求解（x+2y+3z)*(x+2y-3z)要步骤 求解一道数学题若x+y+z+3=2(根号x+根号y+1+根号z-1),求（x+y+z)的（y-z）次方 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 2(x+y)(x+y-z)+3(y-z)(x+y-z) x+y+z=4 x-2y+z=-2 x+2y+3z=0求解用2元一次方程消元法求解 中学3元1次方程求解x+y+z=35x-y+z=9x-2y+7z=24求解!求过程! (x-3y+2z)(x+3y-2z) （x-2y+3z)(x+2y-3z) (2y-x-3z)(-x-2y-3z) x+5y-3z=0 y+4z=9 2x-z=0 三元一次求解、急!x+5y-3z=0y+4z=92x-z=0 2(x+y-z)-3(x-y+z)-5(x+y-z)+6(x-y+z) 计算 证明 ：x/(y+z)+y/(z+x)+z/(x+y)>=3/2其中 x,y,z>0 三元一次方程求解：①x+2z=3,2x+y=2,2y+z=7.②x+y+z=2,3x-y-4z=5,2x+3y-2z=0. 化简-(-3x-y+2z)-{-x+【4x-(x-y-z)-3x+2z}