求助一道题

Louisa_xy

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!!!

joywzy

(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

Louisa_xy

谢谢joywzy,不过答案是A吧（笔误？）

lisaislisa

agree A ^^