3a^2-12 3(a^2-4) 3(a-2)(a+2) 3(a-2)(a+2)
----------- = ------------------- = ---------------------- = ----------------------- =
a^2+6a+8 a^2+6a+9-1 (a+3)^2-1 (a+3-1)(a+3+1)
3(a-2)(a+2) 3(a+2)
----------------- = ---------
(a-2)(a+4) a+4
---------------------------------------------------------------------------------------------------------------------
2m^2-5m+2 2m^2-m-4m+2 m(2m-1)-2(2m-1)
-------------------- = ----------------------- = ----------------------- =
mn-2n-3m+6 n(m-2)-3(m-2) (m-2)(n-3)
(m-2)(2m-1) 2m-1
----------------- = ---------
(m-2)(n-3) n-3