If X*Y=1, what is the value of 2(x+y)[sup]2[/sup]/2(x-y)[sup]2[/sup]?
A. 2
B. 4
C. 8
D. 16
E. 32
答案是D...
這題也很怪
算了10多分鐘也算不出所以然
再次麻煩高手了....
[問題]新PP-test1的一道題
版主: shpassion, Traver0818
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Re: [問題]新PP-test1的一道題
由 enim » 2005-12-12 02:14
jim9619 \$m[1]:If X*Y=1, what is the value of 2(x+y)[sup]2[/sup]/2(x-y)[sup]2[/sup]?
A. 2
B. 4
C. 8
D. 16
E. 32
答案是D...
這題也很怪
算了10多分鐘也算不出所以然
再次麻煩高手了....
這題不知道是不是有討論過了！我怎麼記得我看過！結果匯總區沒有！
印象中是題目錯了
應該是
2[sup](x+y)^2[/sup]/2[sup](x-y)^2[/sup]
2[sup]x^2+y^2+2xy[/sup]/2[sup]x^2+y^2-2xy[/sup]
令x[sup]2[/sup]+y[sup]2[/sup]=t
代入得出2[sup]t+2[/sup]/2[sup]t-2[/sup]
得出16
FYI
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∼Look for unknown new roads even when men's sight is keener far from now.
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☆You take the torch of knowledge and build the palace of the future.．．．．Madame Curie
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enim - 中級會員
- 文章: 245
- 註冊時間: 2005-03-25 09:28
- 來自: Taiwan
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