在平面直角坐标系中,O为坐标原点,已知向量a=(-1,2),点A(1,0),B(cosx,t).(1)若向量a⊥向量AB,且︱向量AB︱(绝对值)=根号5︱向量OA︱,求向量OB.(2)若向量a与向量AB共线,求向量OB·向量AB的最小
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![在平面直角坐标系中,O为坐标原点,已知向量a=(-1,2),点A(1,0),B(cosx,t).(1)若向量a⊥向量AB,且︱向量AB︱(绝对值)=根号5︱向量OA︱,求向量OB.(2)若向量a与向量AB共线,求向量OB·向量AB的最小](/uploads/image/z/8600135-23-5.jpg?t=%E5%9C%A8%E5%B9%B3%E9%9D%A2%E7%9B%B4%E8%A7%92%E5%9D%90%E6%A0%87%E7%B3%BB%E4%B8%AD%2CO%E4%B8%BA%E5%9D%90%E6%A0%87%E5%8E%9F%E7%82%B9%2C%E5%B7%B2%E7%9F%A5%E5%90%91%E9%87%8Fa%3D%28-1%2C2%29%2C%E7%82%B9A%281%2C0%29%2CB%28cosx%2Ct%EF%BC%89.%EF%BC%881%EF%BC%89%E8%8B%A5%E5%90%91%E9%87%8Fa%E2%8A%A5%E5%90%91%E9%87%8FAB%2C%E4%B8%94%EF%B8%B1%E5%90%91%E9%87%8FAB%EF%B8%B1%EF%BC%88%E7%BB%9D%E5%AF%B9%E5%80%BC%EF%BC%89%3D%E6%A0%B9%E5%8F%B75%EF%B8%B1%E5%90%91%E9%87%8FOA%EF%B8%B1%2C%E6%B1%82%E5%90%91%E9%87%8FOB.%EF%BC%882%EF%BC%89%E8%8B%A5%E5%90%91%E9%87%8Fa%E4%B8%8E%E5%90%91%E9%87%8FAB%E5%85%B1%E7%BA%BF%2C%E6%B1%82%E5%90%91%E9%87%8FOB%C2%B7%E5%90%91%E9%87%8FAB%E7%9A%84%E6%9C%80%E5%B0%8F)
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