Odpowiedź :
Odpowiedź:
(2√2 - 1)² - (2√2 -1)(1+ 2√2) - (2√2 + 1)² =
= 4 * 2 - 4√2 + 1 - (2√2 - 1)(2√2 + 1) - ( 4 * 2 + 4√2 + 1) =
= 8 - 4√2 + 1 - (4 * 2 - 1) - 8 - 4√2 - 1 = 9 - 4√2 - 7 - 9 - 4√2 =
= - 7 - 8√2
Odpowiedź:
(2√2 - 1)² - (2√2 -1)(1+ 2√2) - (2√2 + 1)² =
= 4 * 2 - 4√2 + 1 - (2√2 - 1)(2√2 + 1) - ( 4 * 2 + 4√2 + 1) =
= 8 - 4√2 + 1 - (4 * 2 - 1) - 8 - 4√2 - 1 = 9 - 4√2 - 7 - 9 - 4√2 =
= - 7 - 8√2