Question

Срочно $\frac{x^2+2xy+y^2}{a^2-b^2}$ : $\frac{x+y}{a+b}$

Answer 1

$\frac{x {}^{2} + 2xy + y {}^{2} }{a {}^{2} - b {}^{2} } \div \frac{x + y}{a + b} = \\ \frac{(x + y) {}^{2} }{(a - b)(a + b)} \times \frac{a + b}{x + y} = \\ \frac{x + y}{a - b}$