срочно помогите (((
сократите выражение:
а) ( х-3) в квадрате +х(х+9)
б) (2а+5) в квадрате-5(4а+5)
в) (b-4)в квадрате+(b-1) (2-b)
г) 9b(b-1)-(3b+2)в квадрате
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