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Svar 2.1:5

a)	\displaystyle \displaystyle \frac{1}{1-x}	b)	\displaystyle -\displaystyle \frac{1}{y(y+2)}
c)	\displaystyle 3(x-2)(x-1)	d)	\displaystyle \displaystyle \frac{2(y+2)}{y^2+4}