Question

Выполните действие: 1) 7a/p - a/3p 2) 3/a-3 - a-1/a²-9

Answer 1

1) $\frac{7a}{p} - \frac{a}{3p} = \frac{21ap-ap}{3 p^{2} } = \frac{20ap}{3 p^{2} } = \frac{20a}{3p}$
2) $\frac{3}{a-3} - \frac{a-1}{a^{2}- 9 } = \frac{3}{a-3} - \frac{a-1}{(a-3)(a+3)} = \frac{3a+9-a+1}{ a^{2}- 9 } = \frac{2a+10}{ a^{2}-9 }$