Question

помогите пожалуйста​

Answer 1

$\frac{5}{3a} - \frac{2}{9b} = \frac{5 \times 3b - 2a}{9ab} = \frac{15b - 2a}{9ab}$

$\frac{x}{ab} + \frac{x}{ac} = \frac{xc + xb}{abc} = \frac{x(c + b)}{abc}$

$\frac{2x - 3y}{x} + \frac{4x {}^{2} - 5y {}^{2} }{xy} = \frac{y(2x - 3y) + 4x {}^{2} - 5y {}^{2}}{xy} = \frac{2xy - 3y {}^{2} + 4x {}^{2} - 5y {}^{2} }{xy} = \frac{2xy - 8y {}^{2} + 4x {}^{2} }{xy} = \frac{2(xy - 4y {}^{2} + 2x {}^{2}) }{xy}$

$\frac{5x}{a {}^{2} } - \frac{2y}{a {}^{3} } = \frac{5ax - 2y}{a {}^{3} }$