упростите выражение и найдите его значение:
а) (a+3)²-(a-2)(a+2) при a=-3,5
б) (х-3)²-(х+3)(х-3) при х=-0,1
в) (m+3)²-(m-9)(m+9) при m=-0,5
г) (с+2)²-(с+4)(с-4) при с=1/4
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