若X+Y-Z=11,Y+Z-X=5,Z+X-Y=1,则X+Y+Z=?
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若X+Y-Z=11,Y+Z-X=5,Z+X-Y=1,则X+Y+Z=?若X+Y-Z=11,Y+Z-X=5,Z+X-Y=1,则X+Y+Z=?若X+Y-Z=11,Y+Z-X=5,Z+X-Y=1,则X+Y+Z
若X+Y-Z=11,Y+Z-X=5,Z+X-Y=1,则X+Y+Z=?
若X+Y-Z=11,Y+Z-X=5,Z+X-Y=1,则X+Y+Z=?
若X+Y-Z=11,Y+Z-X=5,Z+X-Y=1,则X+Y+Z=?
3式相加
x+y-z+y+z-x+z+x-y=11+5+1
x+y+z=17
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三式相加得：X+Y+Z=17
{x+y-z=11 y+z-x=5 z+x-y=1
{x+y-z=11,x-y-z=-5,x-y+z=1
(x+y-z)(x-y+z)=
若z分之x+y+z=y分之x-y+z=x分之-x+y+z,求xyz分之(x+y)(y+z)(z+x)
若X+Y-Z=11,Y+Z-X=5,Z+X-Y=1,则X+Y+Z=?
X+Y+Z=?
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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
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