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标题: One D/S question [打印本页]

作者: lololo 时间: 2004-8-4 19:43 标题: One D/S question

What is the value of k^2-k? 1). The value of k-1/k is 1, 2). The value of 2k-1 is 5^1/2

Can anybody expain why the answer is D instead of B? Thank you very much.

作者: liuliyun 时间: 2004-8-4 19:47

k-1/k=1

k*k-1=k

k*k-k=1

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