√ax square+2√a square x-√4ax square-a√4x
3(√12-√27)square+(√48-√75)(-3√48-2√75)
(1-m√2)cube
maths questions
2009-02-13 6:47 am
回答 (2)
2009-02-13 8:07 am
✔ 最佳答案
我答第二題3(√12-√27)^2+(√48-√75)(-3√48-2√75)
＝3(2√3-3√3)^2+(4√3-5√3)[-3(4√3)-2(5√3)]
= 3[(2√3)^2-2(2√3)(3√3)+(3√3)^2]+(-√3)(-22√3)
=3[12-36+27]+66
=9+66
=75
參考: ME
2009-02-13 8:32 am
收錄日期: 2021-04-23 20:36:15
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090212000051KK02037