X-y-z=x+( )=x-( ) 1-x+2xy-y=1-( )
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已知 x/(y+z)+y/(z+x)+z/(x+y)=1求 (x*x)/(y+z)+(y*y)/(x+z)+(z*z)/(x+y)=?
(x+y-z)(x-y+z)=
z+=x>y?++x:
X+Y+Z=?
x/y=(x+z)/(y+z)y/z=(x+y)/(x+z)
{x+y-z=11 y+z-x=5 z+x-y=1
{x+y-z=11,x-y-z=-5,x-y+z=1
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