x,y,z对t求导,t取1时,斜率为（3,4,5）
过（1,1,1）
所以切线方程为：
（x-1）/3=(y-1)/4=(z-1)/5
向量函数题目Let x=t^5,y=t^4,z=t^3,t∈R.Find the equation of tangent
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