作者goblin7 (yunyun)
看板GMAT
標題Re: [計量] GWD5 Q7
時間Wed Apr 9 00:48:29 2008
記得大原則先乘除後加減
還有根號合理化原則
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)》之銘言：
: √[2√63 + 2/(8+3√7)] =
: pls help?????
: Thank you
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※ 編輯: goblin7 來自: 220.137.103.227 (04/11 00:06)