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标题: GWD 4-18 [打印本页]

作者: piqiuwawa 时间: 2005-12-10 20:15 标题: GWD 4-18

Q18:

Which of the following is equal to (2^k)(5^{k −}¹)?

A, 2(10^k^{− 1})

B. 5(10^k^{− 1})

C. 10^k

D. 2(10^k)

E. 10²^k^{− 1}

it seems like there is a formula..but i cannot remember it at all, 请指點一下!

Answer is A

作者: piqiuwawa 时间: 2005-12-11 20:28

谢谢！！！

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