Ответ:
( x - 3y)² - (3x - y)² = x² - 6xy + 9y² - (9x² - 6xy + y²) = x² - 6xy + 9y² - 9x² + 6xy - y² = -8x² + 8y² = -72 + 98 = 26
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Ответ:
( x - 3y)² - (3x - y)² = x² - 6xy + 9y² - (9x² - 6xy + y²) = x² - 6xy + 9y² - 9x² + 6xy - y² = -8x² + 8y² = -72 + 98 = 26