(x+y)²-(x-y)²/4xy = 4xy/(4xy) = 1
(x+y)²+(x-y)²/x²+y² = (x² + 2xy + y² + x² - 2xy + y²)/(x² + y²) = (2x² + 2y²)/(x² + y²) = 2(x² + y²)/(x² + y²) = 2
Ответ: 1; 2.
(x+y)²-(x-y)²/4xy = 4xy/(4xy) = 1
(x+y)²+(x-y)²/x²+y² = (x² + 2xy + y² + x² - 2xy + y²)/(x² + y²) = (2x² + 2y²)/(x² + y²) = 2(x² + y²)/(x² + y²) = 2
Ответ: 1; 2.