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标题: one math question [打印本页]

作者: kuuiytt 时间: 2005-4-18 06:24 标题: one math question

207. a,b are positive integers, a^b=?
1) b^a=9
2） a^(2b)=64
why 选d?

It should be "B". because for 1) 9^1 and 3^2 all =9. so by 1) can't decide a^b.

NN please confirm.

作者: himba 时间: 2005-4-18 06:27

It should be D.

because 2) a=2 b=3 or a=8 b=1 can meet the requirement, so 2) can't decide a^b.

so 1),2) together can decide a^b.

作者: kuuiytt 时间: 2005-4-22 12:52

thanks a lot !!!

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