f(x,y)=(x^2+y^2)/(x+y) 求这个多元函数在(0,0)点的极限小弟想了一下午,想不出严密的求法.存在,等于0.)求数学达人相助.跪谢!微积分(III),清华大学出版社,第56页题目2(2)。
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