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Решите задачу:

$\frac{5}{b + 2} - \frac{1}{b} \\ \\ \frac{5b - (b + 2)}{b \times (b + 2)} \\ \\ \frac{5b - b - 2}{b \times (b + 2)} \\ \\ \frac{5b - b - 2}{b {}^{2} + 2b } \\ \\ \frac{5b - b - 2}{b {}^{2} + 2b} \\ \\ \frac{4b {}^{2} - 2}{b {}^{2} + 2b} \\ \\ \\ \\ 2) \frac{x {}^{2} - 3xy }{x {}^{2} - y {}^{2} } + \frac{y}{x - y} \\ \\ \frac{x {}^{2} - 3xy}{(x - y) \times (x + y)} + \frac{y}{x - y} \\ \\ \frac{x {}^{2} - 3xy + y \times (x + y) }{(x - y) \times (x + y)} \\ \\ \frac{x { }^{2} - 3xy + xy + y {}^{2} }{(x - y) \times (x + y)} \\ \\ \frac{x {}^{2} - 2xy + y {}^{2} }{(x - y) \times (x + y)} \\ \\ \frac{(x - y) {}^{2} }{(x - y) \times (x + y)} \\ \\ \frac{x - y}{x + y}$