Question

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Answer 1

Объяснение:

а)

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

б)

$\frac{3}{x} + \frac{ x - 3 }{x + 5} =\frac{3\left(x+5\right)}{x\left(x+5\right)}+\frac{\left(x-3\right)x}{x\left(x+5\right)} =\frac{3\left(x+5\right)+\left(x-3\right)x}{x\left(x+5\right)} =\frac{3x+15+x^{2}-3x}{x\left(x+5\right)} =\frac{15+x^{2}}{x\left(x+5\right)} =\frac{15+x^{2}}{x^{2}+5x}$