Question

(√2-1)la a doua -(1-√2)la a doua dau 30 de puncte

Answer 1

(√2-1)^2-(1-√2)^2=
2-2√2+1-(1-2√2+2)=2-2√2+
1-1+2√2-2=0

Answer 2

Desfacem parantezele tinand cont de formulele de calcul prescurtat sugerate.
(√2-1)²- (1-√2)²=$2-2 \sqrt{2} +1-1+2 \sqrt{2} -2 = 0$
S-au redus termenii asemenea si am obtinut 0.
S-a redus :  -2 √2cu +2√2 , si -2 cu +2 ,asa ca , in final am obtinut 0.