1. Выполните действия:

а) (3ab + 5a – b) – (12ab – 3a);

б) 2х2(3 – 5х3);

в) (2а – 3с)(а + 2с);

г) (у – 1)(у2 + 2у – 4);

д) (3х3 – 6х2): 3х2

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