Question

пожалуйста упростите!

Answer 1

1)$frac{1}{b-2}- frac{2}{ b^{2}-2b } = frac{b-2}{ b^{2} -2b} = frac{b-2}{b(b-2)} = frac{1}{b}$ 
2)$frac{1}{b} * frac{6b}{ b^{2}-9 } = frac{6}{ b^{2} -9}$
3)$frac{1}{b-3} - frac{6}{ b^{2}-9 }= frac{b+3-6}{(b-3)(b+3)} = frac{b-3}{(b-3)(b+3)} = frac{1}{b+3}$

Answer 2

1.
$b frac{1}{b-2}- frac{2}{b(b-2)}= frac{b-2}{b(b-2)}= frac{1}{b}$
2.
$frac{6b}{(b-3)(b+3)} * frac{1}{b} = frac{6}{(b-3)(b+3)}$
3.
$frac{1}{b-3} - frac{6}{(b-3)(b+3)} = frac{b-3}{(b-3)(b+3)} = frac{1}{b+3}$