(x+y+z)^5-(x+y-z)^5-(x+z-y)^5-(z+y-x)^5,我可以得出来有xyz这个因式然后设原式=xyz(M(x+y+z)+N(xy+xz+yz))带入2次任意x,y,z,把M,N解出来,得到80xyz（x+y+z),但是没有5次啊,我算错了，但是我再算过一遍后发现当x=1

（x+y+z)^5-x^5-y^5-z^5 (x+y+z)^5-x^5-y^5-z^5 2(x+y-z)-3(x-y+z)-5(x+y-z)+6(x-y+z) 计算 x+y-z=3 y+z-x=5 z+x-y=7 求x,y,z {x+y-z=11 y+z-x=5 z+x-y=1 x/2=y/3=z/5 x+3y-z/x-3y+z {x+y-z=11,x-y-z=-5,x-y+z=1 x+y+z=15 x+5y+10z=70 x,y,z,各是几? x+y+z=15 x+5y+10z=70 x,y,z,各是几? X+Y-Z=15 X+5Y+10Z=70 求：X、Y、Z 1.（x+y-z)+(x-y+z)-(x-y-z) 2.2x-(3x-2y+3)-(5y-2) 已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX.. 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=15 X+5Y+10Z=70,Y.Z的值 (x+y):(y+z):(z+x)=3:4:5 3x+y-z=-4已知(x+y):(y+z):(z+x)=3:4:5 ；3x+y-z=-4求x y z (4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=? x+y+z=4x-5y=y-x+6z,xyz不等0,x:y:z=? x-y/(z-x)(z-y) 一y-z/(x-y)(x-z) ＋z-x/(y-z)(y-x)