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[tex]( \frac{8 \sqrt{21} }{5} ) {}^{2} [/tex]
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Răspuns :

Răspuns:

[tex]( \frac{8 \sqrt{21} }{5} )^{2} = \frac{ {8}^{2} \times 21 }{25} = \frac{64 \times 21}{25} \\ = \frac{1344}{25} = 53.76[/tex]