Which is the greatest among `(sqrt19-sqrt17),(sqrt13-sqrt11),(sqrt7-sqrt5) and (sqrt5-sqrt3)?`

Which is the greatest among (sqrt(19)-sqrt(17)),(sqrt(13)-sqrt(11)),(sqrt(7)-sqrt(5)) and (sqrt(5)-sqrt(3))?

(sqrt7-sqrt5)/(sqrt7+sqrt5)

7/(sqrt5-sqrt3) =

Which of the following surd is the smallest ? sqrt(10)-sqrt(5),sqrt(19)-sqrt(14),sqrt(22)-sqrt(17) and sqrt(8)-sqrt(3)

(iii) (sqrt 5+ sqrt 3)/(sqrt5-sqrt3)+(sqrt5-sqrt3)/(sqrt5+sqrt3) =?

sqrt(3)/(sqrt5+sqrt2-sqrt7)=

Which is greatest (sqrt(7)+sqrt(10)) ro sqrt(3)+sqrt(19)) ?

(sqrt(3)-sqrt(5))(sqrt(3)+sqrt(5))/(sqrt(7)-2sqrt(5))

Which one is greater between (sqrt7 - sqrt5) and (sqrt13 - sqrt11) ?