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[" 28."(1)/((sqrt(3)+sqrt(4)))+(1)/((sqr...

[" 28."(1)/((sqrt(3)+sqrt(4)))+(1)/((sqrt(4)+sqrt(5)))+(1)/((sqrt(5)+sqrt(6)))+(1)/((sqrt(6)+sqrt(7)))+(1)/((sqrt(7)+sqrt(8)))+(1)/((sqrt(8)+sqrt(9)))=?],[[" (a) "sqrt(3)," (b) "3sqrt(3)," (c) "(3-sqrt(3))," (d) "(5-sqrt(5))]]

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The value of (1)/(sqrt(4)+sqrt(5))+(1)/(sqrt(5)+sqrt(6))+(1)/(sqrt(6)+sqrt(7))+(1)/(sqrt(7)+sqrt(8))+(1)/(sqrt(8)+sqrt(9)) is

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(2)/(sqrt(5)+sqrt(3))-(3)/(sqrt(6)+sqrt(3))+(1)/(sqrt(6)+sqrt(5))=?

(1)/(3-sqrt(8))-(1)/(sqrt(8)-sqrt(7))+(1)/(sqrt(7)-sqrt(6))-(1)/(sqrt(6)-sqrt(5))+(1)/(sqrt(5)-2)=5

(1)/(3-sqrt(8))-(1)/(sqrt(8)-sqrt(7))+(1)/(sqrt(7)-sqrt(6))-(1)/(sqrt(6)-sqrt(5))+(1)/(sqrt(5)-2)=5

(1)/(3-sqrt(8))-(1)/(sqrt(8)-sqrt(7))+(1)/(sqrt(7))-sqrt(6))-(1)/(sqrt(6)-sqrt(5))+(1)/(sqrt(5)-2)=5

(1/(3-sqrt(8))-1/(sqrt(8)-sqrt(7)))