a) 61² - 122 * 9 + 9² = 61² - 2 * 61 * 9 + 9² = (61 - 9)² = 52² = 2704
б) 51² - 212 * 12 + 12² = 51² - 2 * 51 * 12 + 12² = (51 - 12)² = 39² = 1521
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a) 61² - 122 * 9 + 9² = 61² - 2 * 61 * 9 + 9² = (61 - 9)² = 52² = 2704
б) 51² - 212 * 12 + 12² = 51² - 2 * 51 * 12 + 12² = (51 - 12)² = 39² = 1521