Question

Допоможіть будь-ласка

Answer 1

$1+\frac{\sqrt{2}}{2} = \frac{2\sqrt{2} }{2} \\2-\frac{\sqrt{2}}{2} = \frac{4-\sqrt{2} }{2} \\4+ (\frac{\sqrt{2}}{2}) ^2 = 4.5\\ (\frac{\sqrt{2}}{2}) ^2 - 3 = -2.5$