a=2√2
b=√2+1/√2-1 se rationalizeaza cu √2+1⇒b=(√2+1)²/1=2+2√2+1⇒b=3+2√2
(a+2)/(a-2)=b⇒(2√2+2)/(2√2-2)=3+2√2 rationalizam cu 2√2+2 si obtinem:
(2√2+2)²/4=3+2√2
(8+8√2+4)/4=3+2√2
(12+8√2)/4=3+2√2
4(3+2√2)/4=3+2√2 simplificam 4 cu 4 si obtinem ca 3+2√2=3+2√2 deci afirmatia este adevarata
