Ajutor pls! Dau coroana!
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ab= radical din 8 * radical din 2= radical din 8*2 = radical din 16 = 4
[tex]\sqrt{3c} * \sqrt{5d} = \sqrt{15} * 1 \\ <=> \\\sqrt{15}\sqrt{c}\sqrt{d}\\ = \sqrt{15} a*b-c*d = 4 - \sqrt{c}\sqrt{d}[/tex]