培优点5平面向量“奔驰定理”1.点P在△ABC内部,满足PA→+2PB→+3PC→=0,则S△ABC∶S△APC为()A.2∶1B.3∶2C.3∶1D.5∶32.点O为△ABC内一点,若S△AOB∶S△BOC∶S△AOC=4∶3∶2,设AO→=λAB→+μAC→,则实数λ和μ的值分别为()A.29,49B.49,29C.19,29D.29,193.△ABC的重心为G,AB=6,AC=8,BC=213,则△BGC的面积为()A.123B.83C.43D.44.如图所示,在△ABC中,AB=8,AC=6,∠BAC=60°,M为△ABC的外心,若AM→=λAB→+μAC→,λ,μ∈R,则4λ+3μ等于()A.34B.53C.73D.835.如图,设P,Q为△ABC内的两点,且AP→=25AB→+15AC→,AQ→=23AB→+14AC→,则下列结论正确的是()①S△ABPS△ABC=15;②S△ABQS△ABC=13;③S△ABPS△ABQ=45;④S△ABPS△ABQ=34.A.①②B.①③C.①②④D.②④6.△ABC的内切圆圆心为O,半径为2,且S△ABC=14,2OA→+2OB→+3OC→=0,则△ABC的外接圆面积为________.7.若△ABC内接于以O为圆心,以1为半径的圆,且3OA→+4OB→+5OC→=0.则△ABC的面积为______.8.已知点P,Q在△ABC内,PA→+2PB→+3PC→=2QA→+3QB→+5QC→=0,则|PQ→||AB→|=________.