упростите выражение. (5а-1)^2+20а
(5a - 1)^2 + 20a = 25a^2 - 10a + 1 + 20a = 25a^2 + 10 a + 1
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(5a - 1)^2 + 20a = 25a^2 - 10a + 1 + 20a = 25a^2 + 10 a + 1