First simplify (x + 1x − 1 + 1x2 − 2x + 1) △ XX − 1, and then select a value of X that you like to calculate

First simplify (x + 1x − 1 + 1x2 − 2x + 1) △ XX − 1, and then select a value of X that you like to calculate

(x + 1x − 1 + 1x2 − 2x + 1) △ XX − 1 = x2 − 1 + 1 (x − 1) 2 × x − 1x = XX − 1, (x ≠ 1) when x = 2, the original formula is 2