Помогите пожалуйста(Выполните действия: a)2x/x-a - 2a/x+a б)2-ab/2a+ab + 2b/2+b в)x²/x²-y² • x-y/x
г)а/3а+3b ÷ a²/a²-b² Заранее спасибо:)
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