Question

[Vu Phuong Thao]

Cho a,b, c thỏa mãn :

\(\frac{a}{b+c+d}=\frac{b}{a+c+d}=\frac{c}{a+b+d}=\frac{d}{a+b+c}\)

\(Tính\) \(P\) = \(\frac{a+b}{c+a}=\frac{b+c}{d+a}=\frac{c+d}{b+a}=\frac{d+a}{b+c}\)