X-Y=Z X+Y+Z=80已知Y等于10求X和Z
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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=80已知Y等于10求X和Z
X+Y=Z X+Y+Z=80已知Y等于10求X和Z
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(x+y-z)(x-y+z)=
已知x+y=3,当y+z=4,x+z=5,则x+y+z等于()
已知{x+z=5 y+z= - 2 y+x=3 ,则x+y+z等于过程。。