作者sacola (再见)
看板trans_math
标题Re: [考古] 94政大资管
时间Sat Jul 1 22:49:00 2006
※ 引述《scoro (史库尔)》之铭言：
: Let R(t) = (t^2,t,2t) parameterize a curve C. Let P be a plan parameterized by
: x + y - 3z = -6 . Find all points of intersection of the curve and plane.
: 有人能解给我看嘛@@? 感谢
: 我不太懂有三变数的题目...
令 x = t^2 y = t z = 2t 代入 x + y - 3z = -6
t^2 + t -3(2t) = -6
t^2 -5t + 6 = 0
t = 2 or 3
(x,y,z) = (4,2,4) or (9,3,6)
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◆ From: 59.121.202.17
※ 编辑: sacola 来自: 59.121.202.17 (07/01 22:49)
1F：→ scoro:感谢@@ 又是我想太复杂了=_=""" 220.136.171.77 07/01 22:53