三道向量题1.设非零向量a.b.c.d,满足d=(a•c)b-(a·b)c,求证a⊥d2.|a|=1,|b|=2.c=a+b.且c⊥a,则向量a与b的夹角余弦值为多少?3.若|a|=1,|b|=2.a与b的夹角为60°,若(3a+5b)⊥(ma-b),则m的值为?
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/12 19:30:28
![三道向量题1.设非零向量a.b.c.d,满足d=(a•c)b-(a·b)c,求证a⊥d2.|a|=1,|b|=2.c=a+b.且c⊥a,则向量a与b的夹角余弦值为多少?3.若|a|=1,|b|=2.a与b的夹角为60°,若(3a+5b)⊥(ma-b),则m的值为?](/uploads/image/z/10410624-0-4.jpg?t=%E4%B8%89%E9%81%93%E5%90%91%E9%87%8F%E9%A2%981.%E8%AE%BE%E9%9D%9E%E9%9B%B6%E5%90%91%E9%87%8Fa.b.c.d%2C%E6%BB%A1%E8%B6%B3d%3D%28a%26%238226%3Bc%29b-%28a%C2%B7b%29c%2C%E6%B1%82%E8%AF%81a%E2%8A%A5d2.%7Ca%7C%3D1%2C%7Cb%7C%3D2.c%3Da%2Bb.%E4%B8%94c%E2%8A%A5a%2C%E5%88%99%E5%90%91%E9%87%8Fa%E4%B8%8Eb%E7%9A%84%E5%A4%B9%E8%A7%92%E4%BD%99%E5%BC%A6%E5%80%BC%E4%B8%BA%E5%A4%9A%E5%B0%91%3F3.%E8%8B%A5%7Ca%7C%3D1%2C%7Cb%7C%3D2.a%E4%B8%8Eb%E7%9A%84%E5%A4%B9%E8%A7%92%E4%B8%BA60%C2%B0%2C%E8%8B%A5%283a%2B5b%29%E2%8A%A5%28ma-b%29%2C%E5%88%99m%E7%9A%84%E5%80%BC%E4%B8%BA%3F)
xUIO@+*U6^
Ҍ`@ͥXK()
*U" d R#qN
y7o7/1TfctսiZCINtKT
t0$Q0Z2$\/Rq0/_m
z
PTM2taNeVizGu*oH#;IsUog9Ym:Zs*G4^SfڑYT#
J_Fdv9\o<_)Gp9I'mMl.|
,YD؏mPDV(xP0AQŰ@NkѰ0g
@2@EF ʆs4%fcȀ%5S.ٚYqFpr 7ˍá@4z;"g
C!HxFp2BvtF2Sڎ܋ ^Ơ`$| 8Kj{*js~,jil;7EvVf~wp&P`#f@X$VPXk'FwKa$VtDkJg