Question

2 12 2 3+bь? - 9 3 - b. + 4. Упростите выражение​

Answer 1

$\displaystyle \frac{2}{3+b}-\frac{12}{b^2-9}+\frac{2}{3-b}=\frac{2}{3+b}-\frac{12}{(b-3)(b+3)}+\frac{2}{-(b-3)}=\\\\\frac{2}{3+b}-\frac{12}{(b-3)(b+3)}-\frac{2}{b-3}=\frac{2(b-3)-12-2(3+b)}{(b-3)(3+b)}=\frac{2b-6-12-6-2b}{b^2-9}=\\\\\frac{-24}{b^2-9}=-\frac{24}{b^2-9}$