[分析] 極限

[cotton757 (cotton757)]

                               X^3 * y
1. Prove that      lim      -------------- = 0
              (x,y)->(0,0)    x^2 + y^4


                      x^2 * y
2.     lim        --------------- = ?
  (x,y)->(0,0)       x^4 + y^2

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