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(3-radical din7)la a 2


Răspuns :

(3-√7)²=9-6√7+7=16-6√7
[tex](3- \sqrt{7} )^2=3^2-2 \cdot 3 \cdot \sqrt{7} + \sqrt{7} ^2=9-6 \sqrt{7} +7=16-6 \sqrt{7} [/tex]