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(3+2√2)^2-(3-√8)^2=?

Răspuns :

(3+2√2)²-(3-√8)²=
(3+2√2)²-(3-2√2)²=
(3+2√2+3-2√2)·(3+2√2-3+2√2)=
 6·4√2= 24√2