‘壹’ 濡备綍鐢ㄥ悜閲忔帹瀵兼洸绾跨殑鏂圭▼
锏惧害鐭ラ亾
濡备綍鐢ㄥ悜閲忔帹瀵兼洸绾跨殑鏂圭▼
shangbingtian2
瓒呰繃13鐢ㄦ埛閲囩撼杩嘥A镄勫洖绛
鍏虫敞
鎴愪负绗1浣岖矇涓
绌洪棿镟茬嚎涓洪敟闱 z=锛坸^2+y^2锛塣锛1/2锛夊强骞抽溃z=2镄勪氦绾
寰楄ユ洸绾跨殑钖戦噺鏂圭▼涓
r=2cos胃i+2sin胃j+2k銆傚悜閲忔柟绋嬬殑镒忎箟灏辨槸浜ょ嚎涓娄竴镣筂(x,y,z)涓庡师镣筄杩炵嚎,
镓琛ㄧず镄勫悜閲弐=OM=(x,y,z)
杩欎釜棰樼洰涓,浜ょ嚎鍙浠ヨ〃绀轰负x^2+y^2=4,z=2
镓浠ュ弬鏁版柟绋嫔彲浠ヨ〃绀轰负x=2cos胃,y=2sin胃,z=2
镓浠r=(x,y,z)=(2cos胃,2sin胃,2)
琛ㄧず鎴愰偅绉嶅舰寮忓氨鏄痳=2cos胃i+2sin胃j+2k