№2 Упростите выражения:
х2 – 4ху + 4у2
25а2 + 10а + 1
16а2 – 24а + 9
(3в-1)(3в+1)
4х2 – 28ху + 49у2
(ху-1)(ху+1)
(3а-4в)(4в+3а)
а2 +10а + 25
1-2в+в2
(12а-25с) (25с+12а)
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