1.如图,已知α∈β=a,b含于β,a∩b=A,且c含于α,c‖a,求证b与c为异面直线2.在正四面体ABCD中,已知E是棱BC的中点,求异面直线AE和BD所成的角的余弦值
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/22 03:29:08
![1.如图,已知α∈β=a,b含于β,a∩b=A,且c含于α,c‖a,求证b与c为异面直线2.在正四面体ABCD中,已知E是棱BC的中点,求异面直线AE和BD所成的角的余弦值](/uploads/image/z/14235855-15-5.jpg?t=1.%E5%A6%82%E5%9B%BE%2C%E5%B7%B2%E7%9F%A5%CE%B1%E2%88%88%CE%B2%3Da%2Cb%E5%90%AB%E4%BA%8E%CE%B2%2Ca%E2%88%A9b%3DA%2C%E4%B8%94c%E5%90%AB%E4%BA%8E%CE%B1%2Cc%E2%80%96a%2C%E6%B1%82%E8%AF%81b%E4%B8%8Ec%E4%B8%BA%E5%BC%82%E9%9D%A2%E7%9B%B4%E7%BA%BF2.%E5%9C%A8%E6%AD%A3%E5%9B%9B%E9%9D%A2%E4%BD%93ABCD%E4%B8%AD%2C%E5%B7%B2%E7%9F%A5E%E6%98%AF%E6%A3%B1BC%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E6%B1%82%E5%BC%82%E9%9D%A2%E7%9B%B4%E7%BA%BFAE%E5%92%8CBD%E6%89%80%E6%88%90%E7%9A%84%E8%A7%92%E7%9A%84%E4%BD%99%E5%BC%A6%E5%80%BC)
xVnH}_v%˨+HeZsmh4tÏI'!&I7CPcs33X)j+zo|};0wW?tw[3m6Tj~~cuYaQQ~PSڋX^Ox{߯_Fcvr@:b/=s= ɲWmvd[=+@ҋgv
7ipHA#݊ɓm$RsZ|7fʯRkHKڦ/b:϶_4$gP0>E{0<]Gn6/Mg{HʴX
N?[PDžYc%ƾ*Mpg1{C^ NC̅쒽i``j"uby3,.S