Сократите дробь
1) 2ab-2a
------------ =
4bc-4c
2)a^2-a
-------- =
a^3-a^2
3) (m-c)^2
----------- =
c^2-cm
4) m^2-2mn+n^2
------------------ =
an-am
1) 2а(b-1) 2a
= ---------- = ------
4c(b-1) 4c