已知x+y+z=5,xy+yz+xz=7,则x^2+y^2+z^2等于?

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已知x+y+z=5,xy+yz+xz=7,则x^2+y^2+z^2等于?已知x+y+z=5,xy+yz+xz=7,则x^2+y^2+z^2等于?已知x+y+z=5,xy+yz+xz=7,则x^2+y^

已知x+y+z=5,xy+yz+xz=7,则x^2+y^2+z^2等于?
已知x+y+z=5,xy+yz+xz=7,则x^2+y^2+z^2等于?

已知x+y+z=5,xy+yz+xz=7,则x^2+y^2+z^2等于?
（x+y+z）^2=x^2+y^2+z^2+2(xy+yz+xz)=25
x^2+y^2+z^2=25-14=11