Question

Doar 18 si 19 va rog mult

Answer 1

Răspuns:

$18 \\ \\ a) \sqrt{2 {}^{22} - {2}^{21} + {2}^{18} } = \\ \sqrt{( {2}^{4} - {2}^{3} + 1) \times {2}^{18} } = \\ \sqrt{16 - 8 + 1} = \\ \sqrt{9 \times 2 ^{18} } = \\ 3 \times 2 ^{9} = \\ 3 \times 512 = \\ 1536$

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