A:①②④⑤
B:①③④⑤
C:③④⑤⑥
D:①④⑤⑥
Look, the computer ____ (be) red.
已知点G是△ABC的重心,AG→=λAB→+μAC→λ,μ∈R若∠A=120°,AB→·AC→=-2,则AG→的最小值是( )
正六边形的外角和是____