Question

решитеееееее плз зззззз

Answer 1

$\frac{(-\sqrt{39}+\sqrt{57})^{2} }{16-\sqrt{247} }=\frac{(-\sqrt{39})^{2}+2*(-\sqrt{39})*\sqrt{57}+(\sqrt{57})^{2}}{16-\sqrt{247} }=\frac{39-2*\sqrt{13*3*19*3}+57 }{16-\sqrt{247} }=\frac{96-2*3*\sqrt{247} }{16-\sqrt{247} }=\frac{6(16-\sqrt{247}) }{16-\sqrt{247} }=6$