0 55694 55702 55708 55712 55718 55720 55724 55730 55732 55738 55744 55748 55750 55754 55760 55762 55768 55772 55774 55778 55780 55784 55786 55788 55789 55790 55792 55793 55794 55796 55798 55802 55804 55808 55810 55814 55820 55822 55828 55832 55834 55838 55844 55850 55852 55858 55862 55864 55870 55874 55880 55888 266669
等于( ) 
),λ∈(0,1) B.λ(
),λ∈(0,
)
),λ∈(0,1) D.λ(
),λ∈(0,
)
e2,b=e1-
e2
等于( ) 
+
B.－
BC,OD与BA相交于E.求证：BE=
BA.
,且λ+μ=1,λ,μ∈R.
,
=a, 
=b, 
=c,试求
、
.
=e1+e2,
=2e1+8e2,
=3(e1-e2),求证：A、B、D三点共线;
BD.
=a1
+a200
,且A、B、C三点共线(该直线不过原点O),则S200等于( )