讨论函数f(x,y)=xy/(2-根号(4+xy)),xy不等于0;4,xy=0,在点(0,0),(1,0),(1,2)处的连续性

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讨论函数f(x,y)=xy/(2-根号(4+xy)),xy不等于0;4,xy=0,在点(0,0),(1,0),(1,2)处的连续性讨论函数f(x,y)=xy/(2-根号(4+xy)),xy不等于0;4

讨论函数f(x,y)=xy/(2-根号(4+xy)),xy不等于0;4,xy=0,在点(0,0),(1,0),(1,2)处的连续性
讨论函数f(x,y)=xy/(2-根号(4+xy)),xy不等于0;4,xy=0,在点(0,0),(1,0),(1,2)处的连续性

讨论函数f(x,y)=xy/(2-根号(4+xy)),xy不等于0;4,xy=0,在点(0,0),(1,0),(1,2)处的连续性
应该是考虑在3点处左右极限吧.还有函数在0,1处有没有值