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标题: 一道GWD [打印本页]

作者: ellen要雪耻 时间: 2005-11-13 13:32
标题: 一道GWD

If 3^6x = 8,100, what is the value of (3^x^{– 1})³ ?

A. 90

B. 30

C. 10

D. 10/3

E.10/9

作者: ershao 时间: 2005-11-13 23:03

3^(6X)=3^[(3X)*2]=90^2 ,so, 3^(3X)=90

[3^(X-1)]^3=3^(3x-3)=3^(3x)/27=90/27=10/3

so, the answer is D

作者: ellen要雪耻 时间: 2005-11-14 12:50

谢谢ERSHAO

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