Question

СРОЧНО!! РЕШИТЕ ПРИМЕР (1/5x-2/13y)*(1/5x+2/13y) 50 баллов на ответ 10 мин!!!!!

Answer 1

$(\frac{1}{5}x-\frac{2}{13}y)(\frac{1}{5}x+\frac{2}{13}y)=(\frac{1}{5}x)^{2}-(\frac{2}{13}y)^{2}=\frac{1}{25}x^{2}-\frac{4}{169}y^{2}$