I assume you mean a button xy found in many calculators.
This is simply `raise x to the power of y` function that's quite useful as it allows you to raise to power, draw roots(square root is the same as x0.5) etc.
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Suppose the two numbers are x and y. Then, the sum of THEIR reciprocals is 1/x + 1/y = y/xy + x/xy = (y + x)/xy = 7/25
xy - 4
0.5xy or xy/2
Suppose the numbers are x and y. The sum of their reciprocals = 1/x + 1/y = y/xy + x/xy = (y+x)/xy = (x+y)/xy = 10/30 = 1/3
xy-3 where x and y are the two numbers.