1.

i so lets stoot,1-긔

Answer»

pqr = 1

r = 1/pq

1/r = pq

(1/1+p+q^-1) + (1/1+q+r^-1) + (1/1+r+p^-1)

(1/(1+p+1/q) + (1/(1+q+pq) + (1/(1+1/pq+1/p)

(1/(q+pq+1/q) + (1/(q+pq+1) + (1/(q+pq+1/pq)

(q/q+pq+1) + (1/q+pq+1) + (pq/q+pq+1)

(q+pq+1) / (q+pq+1)

= 1



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