这是我在涛涛的GWD上见到的,没有思路,请教各位NN。
√[2√63 + 2/(8+3√7)] =
A. 8 + 3√7
B. 4 + 3√7
C. 8
D. 4
E. √7
答案:D
举报
1/(8+3√7)*1/(8-3√7)*(8-3√7)=2(8-3√7)=16-6√7
2√63=6√7
add them up
very strange!i can't slove the problem too at first glance!
kallyli 发表于 2006-6-21 13:32 1/(8+3√7)*1/(8-3√7)*(8-3√7)=2(8-3√7)=16-6√72√63=6√7add them up
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