x+y+z=24 x=y+2 x+y=z
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x+y+z=24x=y+2x+y=zx+y+z=24x=y+2x+y=zx+y+z=24x=y+2x+y=z
x+y+z=24 x=y+2 x+y=z
x+y+z=24 x=y+2 x+y=z
x+y+z=24 x=y+2 x+y=z
x-y/(z-x)(z-y) 一y-z/(x-y)(x-z) +z-x/(y-z)(y-x)
2分之一(x+y+z)的平方+2分之一(x-y-z)(x-y+z)-z(x+y),其中x-y=6,xy=21
x+y+z=24 x=y+2 x+y=z
(x+y-z)(x-y+z)=
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X+Y+Z=?
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