Question

срочно, решите пример

Answer 1

$\frac{4ab}{a - b} \times \frac{ {a}^{2} - ab }{8b} = \\ \frac{4a {}^{3}b - 4a {}^{2} b {}^{2} }{8ab - 8b {}^{2} } = \\ \frac{4 {a}^{2} b(a - b)}{8b(a - b)} = \\ \frac{ {a}^{2} }{2} = \frac{19 {}^{2} }{2} = \frac{361}{2} = 180.5$

Answer 2

$\frac{4ab}{a-b}* \frac{a^{2}-ab}{8b} = \frac{4ab*a(a-b)}{(a-b)*8b} = \frac{ a^{2} }{2}$

при а=19 получим 19²/2=180,5