Question

вычислите $frac{4}{ sqrt{13 } -3} - frac{9}{ sqrt{13}-2 }$

Answer 1

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Answer 2

$frac{4}{ sqrt{13} -3} - frac{9}{ sqrt{13} -2} = frac{4( sqrt{13} -2)}{( sqrt{13}-3)( sqrt{13} -2)} - frac{9( sqrt{13}-3) }{( sqrt{13}-3)( sqrt{13} -2 )} = \ = frac{4 sqrt{13} -8-9 sqrt{13} +27}{13-2 sqrt{13}-3 sqrt{13} +6 }= frac{-5 sqrt{13} +19}{-5 sqrt{13} +19} =1$