XY/(9X²+Y²)ï¼å
¶ä¸ï¼X,Yï¼è¶äºï¼0,0ï¼ï¼æéçäºå¤å°ï¼
解ï¼(x➔0ï¼y=kx➔0)lim[XY/(9X²+Y²)]=(x➔0ï¼y=kx➔0)lim[kx²/(9x²+k²x²)]=k/(9+k²)
æ
æéä¸å¨ç¹(xï¼y)è¶è¿(0ï¼0)çè·¯å¾(å³kå¼)æå
³ï¼å æ¤è¯¥æéä¸åå¨ï¼å³æ²¡ææéã
温馨提示:答案为网友推荐,仅供参考