Question

Va rog urgent exercitiile 2 si 3

Answer 1

$2) \\ \\ (6 - \sqrt{3}) ^{2} + (6 + \sqrt{3}) ^{2} - 2 \times (6 - \sqrt{3}) ^{2} \times (6 + \sqrt{3}) ^{2} = \\ \\ (6 - \sqrt{3} ) ^{2} + (6 + \sqrt{3})^{2} - 2( {6}^{2} - { \sqrt{3} }^{2}) = \\ \\ (6 - \sqrt{3}) ^{2} + (6 + \sqrt{3}) ^{2} - 2(36 - 3) = \\ \\ (6 - \sqrt{3}) ^{2} + (6 + \sqrt{3}) ^{2} - 2 \times 33 = \\ \\ (6 - \sqrt{3}) ^{2} + (6 + \sqrt{3}) ^{2} - 66 = \\ \\ {6}^{2} - 2 \times 6 \sqrt{3} + { \sqrt{3} }^{2} + {6}^{2} + 2 \times 6 \sqrt{3} + { \sqrt{3} }^{2} - 66 = \\ \\ 36 - 12 \sqrt{3} + 3 + 36 + 12 \sqrt{3} + 3 - 66 = \\ \\ (36 + 3 + 36 + 3 - 66) + ( - 12 \sqrt{3} + 12 \sqrt{3}) = 12$