作者goblin7 (yunyun)
看板GMAT
标题Re: [计量] GWD5 Q7
时间Wed Apr 9 00:48:29 2008
记得大原则先乘除後加减
还有根号合理化原则
解法如下
√[2√63 + 2/(8+3√7)]
=√[6√7 + 2(8-3√7)/(8+3√7)(8-3√7)]
=√[6√7 + 2(8-3√7)]
=√[6√7 + 16-6√7]
=√16
= 4
※ 引述《yihuac (a kitty likes a piggy)》之铭言：
: √[2√63 + 2/(8+3√7)] =
: pls help?????
: Thank you
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※ 编辑: goblin7 来自: 220.137.103.227 (04/11 00:06)