Question

Calculati √605 si √578 cu doua zecimale exacte si apoi calculati: [(√2+√5)^3].

Answer 1

$\sqrt{605} = \sqrt{11 ^{2} \times 5 } = 11 \sqrt{5}$
$\sqrt{578} = \sqrt{17 ^{2} \times 2 } = 17 \sqrt{2}$
$(\sqrt{2} + \sqrt{5} )^{3} = 11 \sqrt{5} + 17 \sqrt{2}$