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(3√2+1) (3√2-1) cum se face ?

Răspuns :

(3√2 + 1)(3√2 - 1) = 
(3√2)² - 3√2 + 3√2 - 1 = 
9 * 2 - 1 = 
18 - 1 =
17
(3√2+1)(3√2-1)= (3√2)²-1²= 9·2-1=18-1 =17