推 zczcgery:1. 用lim n->0+ 以及 lim n->0-去解 2.用微分定義去解 02/13 21:51
Consider
xy^2/x^2+y^2 if (x,y)不等於(0,0)
f(x,y)=
0 if (x,y)等於(0,0)
Is f continuous at (0,0)? How about differentiability
請問大大們~這題要怎麼解呢?
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