с/с^2 -9 + 3/с^2-9=с+3/с^2-9=с+3/ (с-3)×(с+3)= 1/ с-3.
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с/с^2 -9 + 3/с^2-9=с+3/с^2-9=с+3/ (с-3)×(с+3)= 1/ с-3.