October 2021 0 4 Report
  Упростите выражения: 1) (а+с)^2-a^2-2c^2 =   2) -a^2-2ab-(a-b)^2=   3)a^2-b^2-(a+b)^2=   4)-x^2+(x-y)*(x+y)=   Я решила,но не уверенна,что правильно, мне нужно проверить.                     
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