Ответ:
(2a²-4a+1)-(7a²-5a) = 2a²-4a+1-7а²+5а = -5а²+а+1
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Ответ:
(2a²-4a+1)-(7a²-5a) = 2a²-4a+1-7а²+5а = -5а²+а+1