第四届全国大学生数学竞赛预赛试题-(非数学类)参考答案及评分标准
第四届全国大学生数学竞赛预赛试题(非数学类)参考答案及评分标准一、(本题共5小题,每小题各6分,共30分)解答下列各题(要求写出重要步骤).(1)求极限21lim(!)nnn→∞;(2)求通过直线232:55430xyzLxyz0+−+=⎧⎨+−+=⎩的两个相互垂直的平面1π和2π,使其中一个平面过点;(4,3,1)−(3)已知函数,且(,)axbyzuxye+=20,uxy∂=∂∂确定常数a和,使函数满足方程b(,)zzxy=20zzzzxyxy∂∂∂−−+=∂∂∂∂;(4)设函数连续可微,,且()uux=(2)1u=3(2)()Lxyudxxuudy+++∫在右半平面上与路径无关,求;()...
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