4а-16/а²-16 = 4(а-4) / (а-4)(а+4) = 4/а+4
c²+10c+25/5c+25 = (с+5)² /5(с+5) = с+5/5
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4а-16/а²-16 = 4(а-4) / (а-4)(а+4) = 4/а+4
c²+10c+25/5c+25 = (с+5)² /5(с+5) = с+5/5