标题: GWD 5-7 [打印本页]
作者: dlmd 时间: 2005-2-5 14:04 标题: GWD 5-7
Q7:
√[2√63 + 2/(8+3√7)] =
A. 8 + 3√7
B. 4 + 3√7
C. 8
D. 4
E. √7
The question is not clear, would you tell me how to get D as the answer? thanks
作者: sammen 时间: 2005-2-5 22:15
2/(8+3√7)= 2(8-3√7)/ 2/(8+3√7)(8-3√7) =16-6√7和前面的一合并就是16了.
作者: dlmd 时间: 2005-2-6 01:48
lol , it's 2/(8+3√7) 2 divided by (8+3√7), I thought it's 2 root (8+3√7)
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