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) $frac{3}{a-3} - frac{a-1}{a^{2}- 9 } = frac{3}{a-3} - frac{a-1}{(a-3)(a+3)} = frac{3a+9-a+1}{ a^{2}- 9 } = frac{2a+10}{ a^{2}-9 }$