5x²-5y² = 5 (x² - y²) = 5 (x - y) (x + y);
Якщо x = 49, y = 51, то 5 (x - y) (x + y) = 5 * (49 - 51) (49 + 51) = 2 * (- 2) * 100 = - 400
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5x²-5y² = 5 (x² - y²) = 5 (x - y) (x + y);
Якщо x = 49, y = 51, то 5 (x - y) (x + y) = 5 * (49 - 51) (49 + 51) = 2 * (- 2) * 100 = - 400