Răspuns:
[tex]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[/tex]
in rest nu mai am timp ptc am meditații de dimineata si dupa sch...nb...scz daca te superi
