а) 4ху – 2х2у; 2ах2 – 3а2х; -3ах + 2х2; 2х – х2;

б) 4х – 8; х2 – 2х; -5 – 15m; 21mn + 7n;

в) n2 – nm; 6а2 – 9аb; mn – n2; 2ab – 3b2. помогите решить пж, даю 15 баллов ПЖЖЖ​
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