L
leehongki96


Cho xy + yz + zx = 1
Tính tổng :
S=x\sprt[2]{\frac{(1+y^2)(1+z^2)}{1+x^2}}+y\sprt[2]{\frac{(1+z^2)(1+x^2)}{1+y^2}}+z\sprt[2]{\frac{(1+x^2)(1+y^2)}{1+z^2}
Tính tổng :
S=x\sprt[2]{\frac{(1+y^2)(1+z^2)}{1+x^2}}+y\sprt[2]{\frac{(1+z^2)(1+x^2)}{1+y^2}}+z\sprt[2]{\frac{(1+x^2)(1+y^2)}{1+z^2}