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taisasnitko

Ответ:

Объяснение:2)=n²-m²

4)=9-c²;

6)=a²-49;

8)=a²-4/81;

10)=0,16-n²;

12)=d²-4,84. везде применяем формулу  (a-b)(a+b)=a²-b².

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