Question

Выполните действия::::::::​

Answer 1

Ответ:

а)

$\frac{7x - 9}{8x} + \frac{9x - 7}{8x} = \frac{7x - 9 + 9x - 7}{8x} = \frac{16x - 16}{8x} = \frac{16(x - 1)}{8x} = \frac{2(x - 1)}{x} = \frac{2x - 2}{x}$

б)

$\frac{bx - by}{b {}^{2} x {}^{2} } \times \frac{x {}^{2} b}{2x - 2y} = \frac{b(x - y)}{b {}^{2} x{}^{2} } \times \frac{x {}^{2}b }{2(x - y)} = \frac{b}{b} \times \frac{1}{2} = 1 \times \frac{1}{2} = \frac{1}{2}$