求解(x+2y+3z)*(x+2y-3z)
2x+3y+z=11,3x+y-z=2,x+y+z=6求解
x+y+z=4 x-2y+z=-2 x+2y+3z=0求解
求解三元一次方程组:{x+y/2=y+z/3=z+x/4 x+y+z=27
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
x/2=y/3=z/5 x+3y-z/x-3y+z
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
三元一次方程组求解!1) X+Y+Z= 1 X+Y+2Z=2 X+3Y+Z=3 2) X+Y+Z=1 X+Y+2Z=2
1.(x+y-z)+(x-y+z)-(x-y-z) 2.2x-(3x-2y+3)-(5y-2)
求解2x≥x+y+z 4y≥x+y+Z 8z≥x+y+z x、y、z均大于0
因式分解:25x y^2 z^2 (x+y-z)-30xyz(z-x-y)^2+5x y z^3 (z-x-y)
已知x,y,z 大于0,x+y+z=2,求证 xz/y(y+z)+zy/x(x+y)+yx/z(z+x)大于等于2/3
三元一次方程求解:x+y+z=2,3x-y-4z=5,2x+3y-2z=0.