Question

ДАМ 50 БАЛЛОВ СРОЧНО!!

Answer 1

$\frac{ {x}^{2} }{7a + x} - \frac{49 {a}^{2} }{7a + x} = \frac{ {x}^{2} - 49 {a}^{2} }{7a + x} = \frac{(x - 7a)(x + 7a)}{(7a + x)} = x - 7a$