Answer 5.1:3

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a) \dfrac{x+1}{x^2-1} = \dfrac{1}{x-1}
b) \left(\dfrac{5}{x}-1\right)(1-x)
c) \dfrac{\frac{1}{2}}{\frac{1}{3}+\frac{1}{4}}
d) \dfrac{1}{1+\dfrac{1}{1+x}}
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