Question

Cele 3 exercitii nu am stiut sa le fac. Va rog, ajutati-ma!

Answer 1

5) (1+$\sqrt{5- \sqrt{3} }$)(1-$\sqrt{5- \sqrt{3} }$)+(1-$\sqrt{7+ \sqrt{3} }$)(1+$\sqrt{7+ \sqrt{3} }$)=1-5-$\sqrt{3}$+1-7+$\sqrt{3}$=2-12=-10