1.Wykonaj dzialania,odpowiedz podaj w najprostszej postaci(podaj dziedzine) a) x-6/x-1+2x-6/x^2-1= b)x+2/x^2-x+3/x^2+x= c)x/x+5+2-3x/3x-1= d)3x^2-x^3/2x-6 * x^2+2x+1/x^4-x^2
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