Question

Va rog ajutor nevoie mare,ofer 50 de puncte,coroana

Answer 1

$3-2 \sqrt{2} - \frac{7}{1-2 \sqrt{2} } =3-2 \sqrt{2}- \frac{7(1+2 \sqrt{2}) }{1-8} =3-2 \sqrt{2} -\frac{7(1+2 \sqrt{2}) }{-7} = \\ =3-2 \sqrt{2} -(-1-2 \sqrt{2})=3-2 \sqrt{2}+1+2 \sqrt{2}=4 e N$
Bafta!