已知向量[tex=5.857x1.286]At676y/Xw+dGpU+zwbIjuladEmKzMtxWa7Rn74Bed3U=[/tex]，[tex=6.5x1.286]wNbMwIpklPDuS9x4wgbFzpefoqcLOIYVeg4tAdFY9uQ=[/tex]，向量[tex=0.5x1.286]m/VGGUpsnKNFGYXigdTc/A==[/tex]在向量[tex=0.571x1.286]mRKL/orzOudCEARA8qn3Kw==[/tex]与向量[tex=0.5x1.286]PGyKeLDo0qv9T0n29ldi6w==[/tex]的角平分线上，且[tex=4.571x1.286]BOfdsd3AdRSrFUPGgx9e+GJ8qrHCNHVpyUNOKi2BlCE=[/tex]，求[tex=0.5x1.286]m/VGGUpsnKNFGYXigdTc/A==[/tex]的坐标。

2022-07-25

已知向量[tex=5.857x1.286]At676y/Xw+dGpU+zwbIjuladEmKzMtxWa7Rn74Bed3U=[/tex]，[tex=6.5x1.286]wNbMwIpklPDuS9x4wgbFzpefoqcLOIYVeg4tAdFY9uQ=[/tex]，向量[tex=0.5x1.286]m/VGGUpsnKNFGYXigdTc/A==[/tex]在向量[tex=0.571x1.286]mRKL/orzOudCEARA8qn3Kw==[/tex]与向量[tex=0.5x1.286]PGyKeLDo0qv9T0n29ldi6w==[/tex]的角平分线上，且[tex=4.571x1.286]BOfdsd3AdRSrFUPGgx9e+GJ8qrHCNHVpyUNOKi2BlCE=[/tex]，求[tex=0.5x1.286]m/VGGUpsnKNFGYXigdTc/A==[/tex]的坐标。

答案：

思路：两个单位向量的和向量即是它们的角平分向量解：[tex=5.857x1.286]At676y/Xw+dGpU+zwbIjuladEmKzMtxWa7Rn74Bed3U=[/tex]，[tex=6.5x1.286]wNbMwIpklPDuS9x4wgbFzpefoqcLOIYVeg4tAdFY9uQ=[/tex]，所以单位化得到：[tex=7.0x2.0]NY1XDIP/OtvptEfa2nvmedulhOt3WbHY3i9XFpgNV5SiDfc/OMt9S2xi8RYpxET+[/tex]，[tex=7.643x2.0]OC7pmFLvcqmk2fnNkc7rkAVShpl3s1Yfplffn6jsHths4+l19+VjG4pENNe+mLmP[/tex]，[tex=9.5x2.0]Ce1nbJghpX1XFlM4tu/TZM1YXNwy15t0N2bNG9gA7O9Cog0dFrR7YUhqi32W3eEv[/tex]，[tex=0.714x1.286]wbdAxWgHFhoV9XdVGDcK2w==[/tex]向量[tex=0.5x1.286]m/VGGUpsnKNFGYXigdTc/A==[/tex]在向量[tex=0.571x1.286]mRKL/orzOudCEARA8qn3Kw==[/tex]与向量[tex=0.5x1.286]PGyKeLDo0qv9T0n29ldi6w==[/tex]的角平分线上[tex=6.643x1.286]xIhevV1//2buconLYqSi0mKLpVAPHtl4UBqDZDde9H3JWGeoKVjMOOETPI2bDlIH[/tex][tex=12.643x1.286]x05outausrMzAA/SltNCOQPQqysj2YvqfBri7Spg2z4bHzBi9py3203SDzTdhg/d/FCwmkzr1LCLxsndJtrVHA==[/tex]，由[tex=4.571x1.286]BOfdsd3AdRSrFUPGgx9e+GJ8qrHCNHVpyUNOKi2BlCE=[/tex]，可得：[tex=2.786x1.286]56Bx0a+dRhs03Z/hAs2VZbzmdIp+iIk2D7meG0JdIiQ=[/tex][tex=0.714x1.286]Mjp1ERIg12NQkOrp1BseMg==[/tex][tex=6.5x1.286]ZyDNX4K+B+2ENvghFQTRUaNOkqX274tI76thwyxLLqQ=[/tex]

举一反三

内容

0
向量[tex=4.857x1.286]D8V0vx8GIFkaW9Wr3cTkgQ==[/tex]，[tex=5.5x1.286]SuF9ioGqfsEWhP0FxHJm8A==[/tex]，[tex=5.5x1.286]F2znh+dupic+SmqBspcaUg==[/tex]，则[tex=3.857x1.286]0LBROb+xu2bkynvd1D9LQ6KBMCF7Mpq/AsJcSDXkvM4=[/tex][input=type:blank,size:4][/input]，[tex=3.071x1.286]9A5Nz54EJJI8b5zx+YqJEclc3OqmWNKnXJzpde/AUKA=[/tex][input=type:blank,size:4][/input]；向量[tex=0.571x1.286]mRKL/orzOudCEARA8qn3Kw==[/tex]在向量[tex=0.5x1.286]PGyKeLDo0qv9T0n29ldi6w==[/tex]上的投影[tex=3.286x1.286]wGfVdUMgAn5LMrF8O6yYwV3vkaAQ2TFHZKAYsbp88SY=[/tex][input=type:blank,size:4][/input]；与向量[tex=0.571x1.286]mRKL/orzOudCEARA8qn3Kw==[/tex]、[tex=0.5x1.286]PGyKeLDo0qv9T0n29ldi6w==[/tex]都垂直且模为3的向量为[input=type:blank,size:4][/input]；以向量[tex=0.571x1.286]mRKL/orzOudCEARA8qn3Kw==[/tex]、[tex=0.5x1.286]PGyKeLDo0qv9T0n29ldi6w==[/tex]为邻边的平行四边形的面积为[input=type:blank,size:4][/input]；以向量[tex=0.571x1.286]mRKL/orzOudCEARA8qn3Kw==[/tex]、[tex=0.5x1.286]PGyKeLDo0qv9T0n29ldi6w==[/tex]与[tex=0.5x1.286]m/VGGUpsnKNFGYXigdTc/A==[/tex]为相邻三边的平行六面体的体积为[input=type:blank,size:4][/input]．
1
已知：直线[tex=0.571x1.286]mRKL/orzOudCEARA8qn3Kw==[/tex]、[tex=0.5x1.286]PGyKeLDo0qv9T0n29ldi6w==[/tex]、[tex=0.5x1.286]m/VGGUpsnKNFGYXigdTc/A==[/tex]、[tex=0.571x1.286]E8TCNnEPtMKJ0mC2xxh0/Q==[/tex]是两两相交且不过同一点的四条直线，求证：直线[tex=0.571x1.286]mRKL/orzOudCEARA8qn3Kw==[/tex]、[tex=0.5x1.286]PGyKeLDo0qv9T0n29ldi6w==[/tex]、[tex=0.5x1.286]m/VGGUpsnKNFGYXigdTc/A==[/tex]、[tex=0.571x1.286]E8TCNnEPtMKJ0mC2xxh0/Q==[/tex]共面。
2
如果正数[tex=0.571x1.286]mRKL/orzOudCEARA8qn3Kw==[/tex]，[tex=0.5x1.286]PGyKeLDo0qv9T0n29ldi6w==[/tex]，[tex=0.5x1.286]m/VGGUpsnKNFGYXigdTc/A==[/tex]，[tex=0.571x1.286]E8TCNnEPtMKJ0mC2xxh0/Q==[/tex]满足[tex=6.143x1.286]ZmgY4IYKNAnTxjSaOa1RjQ==[/tex]，那么未知类型：{'options': ['[tex=4.429x1.286]LJI1FiqfFfvLk57V4PrnIg==[/tex]，且等号成立时[tex=0.571x1.286]mRKL/orzOudCEARA8qn3Kw==[/tex]，[tex=0.5x1.286]PGyKeLDo0qv9T0n29ldi6w==[/tex]，[tex=0.5x1.286]m/VGGUpsnKNFGYXigdTc/A==[/tex]，[tex=0.571x1.286]E8TCNnEPtMKJ0mC2xxh0/Q==[/tex]的取值唯一', '[tex=4.429x1.286]TX9Qz0sE7bWEvnntsBl/HA==[/tex]，且等号成立时[tex=0.571x1.286]mRKL/orzOudCEARA8qn3Kw==[/tex]，[tex=0.5x1.286]PGyKeLDo0qv9T0n29ldi6w==[/tex]，[tex=0.5x1.286]m/VGGUpsnKNFGYXigdTc/A==[/tex]，[tex=0.571x1.286]E8TCNnEPtMKJ0mC2xxh0/Q==[/tex]的取值唯一', '[tex=4.429x1.286]LJI1FiqfFfvLk57V4PrnIg==[/tex]，且等号成立时[tex=0.571x1.286]mRKL/orzOudCEARA8qn3Kw==[/tex]，[tex=0.5x1.286]PGyKeLDo0qv9T0n29ldi6w==[/tex]，[tex=0.5x1.286]m/VGGUpsnKNFGYXigdTc/A==[/tex]，[tex=0.571x1.286]E8TCNnEPtMKJ0mC2xxh0/Q==[/tex]的取值不唯一', '[tex=4.429x1.286]TX9Qz0sE7bWEvnntsBl/HA==[/tex]，且等号成立时[tex=0.571x1.286]mRKL/orzOudCEARA8qn3Kw==[/tex]，[tex=0.5x1.286]PGyKeLDo0qv9T0n29ldi6w==[/tex]，[tex=0.5x1.286]m/VGGUpsnKNFGYXigdTc/A==[/tex]，[tex=0.571x1.286]E8TCNnEPtMKJ0mC2xxh0/Q==[/tex]的取值不唯一', '以上均不正确'], 'type': 102}
3
讨论向量组的线性相关性：[tex=5.643x3.357]SyE/bCD4djK8z50BaLsY0MHt94eSMpxlAqhtoSIKllrk+XcaOYMjaHvEofze1vCRObBmRQio9/fo8iq/ESu3eftperfESHOVqPKtyQ85uhw=[/tex]，[tex=5.714x3.929]aAPe8J4kv5fbIwF6WospiixHqvdYoBdn98ZZAUopjmC5bc94ATvhLCd4Z2tYCBUbRQUDoBZIas/8nknR5hwzm13/epIObbn51gbtcBGiiRw=[/tex]，[tex=5.571x3.357]Hwlex+Cg8fkZ8dZisLXUK5XfHFUgVtYHh6cfSFMcWtlpfhZJXXlKW698NkQW8exETM2RLvEsIpS1PELzfY53LTNj5PhPRom2TTa6HGwZ2zU=[/tex]，其中[tex=0.571x1.286]mRKL/orzOudCEARA8qn3Kw==[/tex]， [tex=0.5x1.286]PGyKeLDo0qv9T0n29ldi6w==[/tex]，[tex=0.5x1.286]m/VGGUpsnKNFGYXigdTc/A==[/tex]， [tex=0.571x1.286]XubEW9+1+hkJqH7jXe5MrA==[/tex]，[tex=0.571x1.286]Hz6y44ELFVLLNrLVhO3CQA==[/tex]，[tex=0.5x1.286]asctJDWpGaq/ETe64ANZ1Q==[/tex]全不为零。
4
设曲线[tex=4.571x1.429]nvmx10kUNAIyP8+dFGOuLg==[/tex]和[tex=4.357x1.429]5+CFrn8UbvOcMTzU45s3GQ==[/tex]在点[tex=3.0x1.357]IuS+jpCX4WU7+Z7SztoPdg==[/tex]相切，求[tex=0.571x1.286]mRKL/orzOudCEARA8qn3Kw==[/tex]，[tex=0.5x1.286]PGyKeLDo0qv9T0n29ldi6w==[/tex]，[tex=0.5x1.286]m/VGGUpsnKNFGYXigdTc/A==[/tex]。