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Daca a+b=√2 si a-b=-√2 supra 2 , calculati a²-b²+2.


Răspuns :

(a+b)(a-b)=a²-b²
√2(-√2/2)=a²-b²
-1=a²-b²
a²-b²+1=0 I+1
a²-b²+2=1