Question

Calculați ! Rezolvare amănunțită,nu răspunsul direct!

Answer 1

$(\sqrt4+\sqrt9-\sqrt{13})(5+\sqrt{13})-\sqrt{(-7)^2}=(2+3-\sqrt{13})(5+\sqrt{13})-|-7|=\\\\=(5-\sqrt{13})(5+\sqrt{13})-7=5^2-(\sqrt{13})^2-7=25-13-7=5.$

Green eyes.