Read the following SAT test question and then click on a button to select your answer.

(9+7i^18)/4-i

The complex expression above is equivalent to the expression a+bi for the rational constants a and b. What is the value of b?

(Note:i=√-1)

(A) b=2/15
(B) b=2/17
(C) b=8/17
(D) b=16/17

来源:可可英语 http://www.kekenet.com/sat/202002/604401.shtml