Ответ:
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(2a - 1/2a)² - 1/4a² = (1 1/2a)² - 1/4a² = (3/2a)² - 1/4a² = 9/4a² - 1/4a² = 8/4a² = 2a²
Подставляем a = 5
2a² = 2 * 5² = 2 * 25 = 50
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Ответ:
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(2a - 1/2a)² - 1/4a² = (1 1/2a)² - 1/4a² = (3/2a)² - 1/4a² = 9/4a² - 1/4a² = 8/4a² = 2a²
Подставляем a = 5
2a² = 2 * 5² = 2 * 25 = 50
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