(x+2y+3z)-(3x+2y-z)+(2x-3y+4z) 用直式计算

(x+2y+3z)-(3x+2y-z)+(2x-3y+4z) 用直式计算 试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y) 计算：3x-2y- [-4x+(z+3y)] x=y/z=z/3,x+y+z ＝12,求2x+3y+4z是多少, x/2=y/3=z/5 x+3y-z/x-3y+z C++计算x=2,y=3,z=4计算z+=x++||y++||++z求x,y,z的值 计算（x+2y-3z)的平方+（x-2y+3z)(x+2y-3z) 1.（x+y-z)+(x-y+z)-(x-y-z) 2.2x-(3x-2y+3)-(5y-2) 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 1.x+y=16,y+z=12,z+x=102.3x-y+z=4,2x+3y-z=12,x+y+z=63.x+y+z=6 (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai