(1)(4/√65,7/√65)
(2)大于10/3
(3)(√2/2,[3√2]/2)
(4)-63 PAI-arccos(63/65)
(5)29/42
(6)19 -1/3 反向
(7)(1)84(2)12(3)arccos(1/4)(4)2/3
(1)(4/√65,7/√65)
(2)大于10/3
(3)(√2/2,[3√2]/2)
(4)-63 PAI-arccos(63/65)
(5)29/42
(6)19 -1/3 反向
(7)(1)84(2)12(3)arccos(1/4)(4)2/3