Question

已知x^a=3，x^b=5，則x^2a-b=

1. A.
   
2. B.
   
3. C.
   
4. D.
   1

Answer 1

C
分析：根據(jù)同底數(shù)冪的除法和積的乘方的法則解答．
解答：原式=x^2a÷x^b
=（x^a）²÷x^b
=3²÷5
=．
故選C．
點(diǎn)評(píng)：本題考查了同底數(shù)冪的除法和冪的乘方，巧妙轉(zhuǎn)化是解題的關(guān)鍵．