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Aratati ca a=2(8+√18)-3•(4+√8)apartine Z

Răspuns :

[tex]a = 2(8 + \sqrt{18} ) - 3(4 + \sqrt{8} )[/tex]

[tex]a = 2( 8 + 3 \sqrt{2} ) - 3(4 + 2 \sqrt{2} )[/tex]

[tex]a = 16 + 6 \sqrt{2} - 12 - 6 \sqrt{2} [/tex]

[tex]a = 4 \: \epsilon \: Z[/tex]