Question

(213 × 657)^–1 = 213^–1 × ___________.

Answer 1

(213*657)^-1=213^-1*_______ (or x)
(139941)^-1=1/213* x
1/139941=1/213*x
213/139941=x
0.00152207=x
152207/100000000=x

Hence,    (213*657)^-1=(213^-1)*(152207/100000000)

Answer 2

(213 × 657)^–1 = 213^–1 × ___________.
1/(213 × 657) = 1/213 * 1/ 657