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katyusha11 $\frac{ \sqrt{ \frac{81}{4} }+4 }{ \sqrt{4}+ \sqrt{ \frac{81}{4} } } = \frac{ \frac{9}{2}+4 }{2+ \frac{9}{2} }= \frac{8,5}{6,5}= \frac{85}{65}= \frac{17}{13}=1 \frac{4}{13}$

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nafanya2014

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(9/2+4)/(2+9/2)=17/2*2/13=17/13

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