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(3√2-1)²-(3√2+1)² cum se rezolva?

Răspuns :

(3√2-1)²-(3√2+1)²=
19-6
√2-6√2-19=
-12√2

(18-6√2+1)-(18+6√2+1)
=18-6√2+1-18-6√2-1
=-12√2