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标题: GWD-3-2 [打印本页]

作者: bipedalisms 时间: 2006-4-23 09:22 标题: GWD-3-2

What is the greatest prime factor of 2¹⁰⁰ - 2⁹⁶?

A. 2

B. 3

C. 5

D. 7

E. 11

answer is C, but I think should be D.

2^100-2^96=2^96(2^4-1)=2^96*7. right?

作者: michellemove 时间: 2006-4-24 04:14

2^4=16

2^4-1=15=5*3

要仔细啊，这种马虎要不得

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