If G is the geometric mean between a and b,show that 1/(G+a)+1/(G+b)=1/G.

And one more question:
The arithmetic mean between two distinct positive numbers is twice the geometric mean between them.Find the ratio of greater to smaller.
Ans (2+?3):(2-?3)

Hi,
In first part it will be G-a and G-b in the denominator

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Incommplet question
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1/(Ga)???1/(Gb)=1/G.?
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