Comments by "Fhf Fhf" (@fhffhff) on "Знай ТВ" channel.

  1. (111^2-777)/2=(12321-777)/2=11544/2=5772
    1
  2. (5+x)^2+x^2=(x+10)^2,x>0, 25+10x+2x^2-x^2-20x-100=0, x^2-10x-75=0, x=(10±√(100+4*75))/2=5±10=15;-5 x=15
    1