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(3√2+7)(7-3√2)+(√6-9)(√6+9

Răspuns :

(3√2+7)(7-3√2)+(√6-9)(√6+9)=
49-9*2+6-81=-44
=(7+3√2)(7-3√2)+(√6)²-9²
=7²-(3√2)²+6-81
=49-18-75
=31-75=-44