(x+y+z)^5-x^5-y^5-z^5
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(x+y+z)^5-x^5-y^5-z^5(x+y+z)^5-x^5-y^5-z^5(x+y+z)^5-x^5-y^5-z^55*(x+y)*(x+z)*(y+z)*(x^2+y*x+z*x+y^2+
(x+y+z)^5-x^5-y^5-z^5
(x+y+z)^5-x^5-y^5-z^5
(x+y+z)^5-x^5-y^5-z^5
5*(x + y)*(x + z)*(y + z)*(x^2 + y*x + z*x + y^2 + z^2 + y*z)
（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=1;x+3y+7z=-1;z+5y+8z=-2