The reciprocal of the product of two continuous natural numbers divided by their difference is 1 / 56. These two natural numbers are ()

Let these two natural numbers be x, x + 1,
X(X+1)/1=56
X^2+X-56=0
(X-7)(X+8)=0
X = 7 or x = - 8,
The two natural numbers are 7 and 8

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