... 50 Chu,o,ng 39. Ðê` thi olympic to´an Iranf (0) = f (x2+ f (x)) −4f (x)2. (2).T`u,(1) v`a (2) ta c´o: ... c.anh trong tam gi´ac, ta t`ım¯du,.o,c13<ab< 334 Chu,o,ng 36. Ðê` thi olympic to´an S´ec v`a C.ông ho`a Slovak36.2. L`o,i gi,aiL`o,i gi,ai 36.1. ... trung¯diê,m c,ua c´ac c.anh BC v`a AD, v`a g.oi A0, D0l`a46 Chu,o,ng 38. Ðê` thi olympic to´an Hong Kong0 ≡ x − kt ≡ y − ks⇒ 0 ≡ s(x − kt) ≡ t(y − ks)⇒ 0 ≡ sx − ty = g(modp)Nhu,v.ây,...