国际顶尖MBA申请交流平台--TOPWAY MBA

标题: 求助一道题 [打印本页]

作者: Louisa_xy 时间: 2003-1-23 09:36 标题: 求助一道题

Does x^°y = y^°x for all x and y?
(1) for all x and y, x^°y = 2(x² + y²)
(2) for all y, 0^°y = 2y²

The answer is A. Why?
Thanks!!!

作者: joywzy 时间: 2003-1-23 13:23 标题: to louisa

(1)=>x^°y = 2(x² + y²), y^n X=2(Y^2+X^2)
=> x^°y = y^°x => 2(x² + y²)=2(Y^2+X^2) for all x and y

(20 => did not tell any information about X,

So i got the answer B

作者: Louisa_xy 时间: 2003-1-23 13:27

谢谢joywzy,不过答案是A吧（笔误？）

作者: lisaislisa 时间: 2003-1-23 20:51

agree A ^^

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