-(3x-2y-z)-2[4x-3(x-2y-3z)-2]怎么算

化简-(-3x-y+2z)-{-x+【4x-(x-y-z)-3x+2z} x+2y=3x+2z=4y+z 求x:y:z x+y/2=z+x/3=y+z/4 x+y+z=27 数学--整式运算4(x-y+z)-2(x+y-z)-3(-x-y-z) 2x+z=10 x+y-z=4 3x-y-z=0 (4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=? 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 求化简(x+3y+2z)(x-3y+6z)(x+3y+4z-2z)(x-3y+4z+2z) 化简下列式子-（7X-Y-2Z）-{[4X-(X-Y-Z）-3X+Z]-X} x=y/z=z/3,x+y+z ＝12,求2x+3y+4z是多少, 因式分解Z^2(x-y)-4(x-y)-3Z(y-z) 12x^2y^3z-8x^3y^2z+4x^2y 设x,y.z为实数,2x.3y.4z是等比数列,1/x,1/y.1/z是等差数列,则(x/z)+(z/x)是多少? 2(x+y)(x+y-z)+3(y-z)(x+y-z) x+y=5 2x+3y-z=9 x-y+z=4 因式分解x^2(y-z)-4(y-z)-3x(x-y) 因式分解:z^2（x-y）-4（x-y）-3z（y-x）