Упростите выражение: 1) 2/m − 16/(m² + 8m); 2) (a − 2)/(2a − 6) − (a − 1)/(3a − 9); 3) (a² + b²)/(2a² + 2ab) + b/(a + b); 4) (b + 4)/(ab − b²) − (a + 4)/(a² − ab).

\(\dfrac{2(m+8)-16}{m(m+8)}=\dfrac{2}{m+8}\).

\(\dfrac{3(a-2)-2(a-1)}{6(a-3)}=\dfrac{a-4}{6(a-3)}\).

\(\dfrac{a^2+b^2+2ab}{2a(a+b)}=\dfrac{(a+b)^2}{2a(a+b)}=\dfrac{a+b}{2a}\).

\(\dfrac{a(b+4)-b(a+4)}{ab(a-b)}=\dfrac{4(a-b)}{ab(a-b)}=\dfrac{4}{ab}\).