每日一题

Mathematics>Standard Multiple Choice

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

(w^(1/2)*w^(1/5)*w^(-7/10))^(-3)

If w is nonzero, which of the following expressions is equivalent to the expression above?

(A) 0
(B) 1
(C) w^(21/100)
(D) w^(7/300)

答案和解析

答案：B

解析：

Choice B is correct. Rewrite the expression using the following fact:

x^m*x^n=x^m+n

The equivalent expression is 1.