Question

(a - c)/(c - a)^1997

Answer 1

$\boxed{\frac{(a-c)}{(c-a)^{1997}}=\frac{-(c-a)}{(c-a)^{1997}}=-\frac{1}{(c-a)^{1996}}=-(c-a)^{-1996}}$

Answer 2

a-c(2)c-a(1997)
1997/2=998-1