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Antwort 2.1:6

a)	\displaystyle 2y	b)	\displaystyle \displaystyle\frac{-x+12}{(x-2)(x+3)}
c)	\displaystyle \displaystyle\frac{b}{a(a-b)}	d)	\displaystyle \displaystyle\frac{a(a+b)}{4b}