Question

aceste ex va rog
sarbatori fericite​

Answer 1

Răspuns:

$b)( { \sqrt{3} })^{2} + 2 \times \sqrt{3} \times 1 + {1}^{2} - \sqrt{3} \times 4 - \sqrt{3} \times 3 \sqrt{3} = \\ = 3 + 2 \sqrt{3} + 1 - 4 \sqrt{3} - 3 \times 3 = \\ = 4 - 2 \sqrt{3} - 9 = - 2 \sqrt{3} - 5$

$c)( { \sqrt{5} })^{2} - 2 \times \sqrt{5} \times 3 + {3}^{2} + 3 \sqrt{5} \times 2 + 3 \sqrt{5} \times ( - \sqrt{5} ) = \\ = 5 - 6 \sqrt{5} + 9 + 6 \sqrt{5} + 3 \times ( - 5) = \\ = 14 - 15 = - 1$

$d)( {2 \sqrt{5} })^{2} + 2 \times 2 \sqrt{5} \times 1 + {1}^{2} + ( { \sqrt{7} })^{2} - ( { \sqrt{2} })^{2} - 2 \sqrt{5} = \\ = 20 + 4 \sqrt{5} + 1 + 7 - 2 - 2 \sqrt{5 } = \\ = 2 \sqrt{5} + 26$