Ответы на вопрос:
A²-b² = (a-b)(a+b) 0.64t² - (t-p)² = (0.8t - (t-p)) * (0.8t + (t-p)) = (0.8t-t+p)(0.8t+t-p) = (p-0.2t)(1.8t-p)
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