Выражение. (a-3/a^2-3a+9 - 6a-18/a^3+27): 5a-15/4a^3+108

( а–3 6а–18 ) 5а–15
– : =
( а^2–3а+9 а^3+27 ) 4а^3+108

а–3 6(а–3)
= – :
(а^2–3а+9) (а+3)(а^2–3а+9)

5(а–3)
: =
4(а+3)(а^2–3а+9 )

(а–3)(а+3)–6(а–3)
= :
(а+3)(а^2–3а+9)

5(а–3)
: =
4(а+3)(а^2–3а+9 )

(а–3)(а+3–6)*4(а+3)(а^2–3а+9)
= =
(а+3)(а^2–3а+9)*5(а–3)

4(а–3)
=
5