[多变] 多变函数之极限

楼主: pppppqqqqq (喝薯条)   2014-06-23 00:37:22
题目是
f(x,y)=(x(x^2+y^2)^-1.5)*e^sin((x^2)*y)
求lim (x,y)->(1,0) (f(x,y)-1)/(x-1)

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