天山-9-6

ninaluan

Q6:

If x and k are integers and (12^X)(4^2X+1) = (2^K)(3^2), what is the value of k?

A. 5

B. 7

C. 10

D. 12

E. 14

Answer:请教为什么选E.?谢谢!!

ninaluan

UP

charmant

原题有误

感觉如果为(12^x)(4^(2x+1))=2^(6x+2)*3^x=2^K*3^2
x=2
6x+2=k
所以k=14

EngineerJia

小学数学~~~~还不算奥林匹克~~

[此贴子已经被作者于2004-12-28 22:52:38编辑过]