作者Eliphalet (冇提就等於唔存在啦)
站内trans_math
标题Re: [微分] 问个简单题目= ="
时间Fri Jul 11 23:43:31 2008
※ 引述《chat543 (小ㄐ)》之铭言:
: Find the points on the sphere x^2+y^2+z^2=1 where the tangent
: plane is parallel to the plane 2x+y-3z= 3
: 算到一半就忘了怎算了~请帮解>"<~
sqrt(2^2+1^2+(-3)^2) = sqrt(14)
2 1 -3
求出通过点 ( --------- , ----------- , ---------- )
sqrt(14) sqrt(14) sqrt(14)
-2 -1 3
和点 ( ---------- , ---------- , ---------- )
sqrt(14) sqrt(14) sqrt(14)
的切平面即可
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※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 122.127.98.113
1F:推 chat543:sqrt 是啥?125.229.193.206 07/11 23:54
2F:→ Eliphalet:square root 开平方根 122.127.98.113 07/11 23:56
3F:推 chat543:这ㄍ方法是啥?~我看的不是很懂= =?125.229.193.206 07/11 23:58
4F:推 chat543:这题应该是只要求点就好了~所以根号14带125.229.193.206 07/12 00:13
5F:→ chat543:进去就好了125.229.193.206 07/12 00:13