These are numbers x such that x = 1/x.
But this means that x2 = 1.
Try solving this last equation for x. (i.e. the only numbers are +1 and -1)
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Reciprocals are numbers that when multiplied together will equal one. 4/5 and 5/4 are reciprocal.
A number divided by its reciprocal is equal to the square of the number.
Reciprocals, or multiplicative inverses
No, they are not!
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