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lim[3-(xy+9)*1\2]\xy=?求详解lim下是x→0y→o
题目详情
lim[3-(xy+9)*1\2]\xy=?求详解
lim下是 x→0 y→o
lim下是 x→0 y→o
▼优质解答
答案和解析
利用分子有理化,原式
=lim[3+(xy+9)^1\2]*[3+(xy+9)^1\2]\(xy*[3+(xy+9)^1\2])
=lim(-xy)/(xy*[3+(xy+9)^1\2])
=lim(-1)/[3+(xy+9)^1\2]
=-1/6
=lim[3+(xy+9)^1\2]*[3+(xy+9)^1\2]\(xy*[3+(xy+9)^1\2])
=lim(-xy)/(xy*[3+(xy+9)^1\2])
=lim(-1)/[3+(xy+9)^1\2]
=-1/6
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