f(x)=x+2/x do kwadratu+4x+4
x+2/x²+4x+4=x+2/(x+2)·(x+2)= tu skracamy licznik z jednym nawiasem z mianownika=1/x+2
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x+2/x²+4x+4=x+2/(x+2)·(x+2)= tu skracamy licznik z jednym nawiasem z mianownika=1/x+2