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∵若A,B兩點在直線l的同側,可作出兩條直線,∴若這樣的直線l可作4條,則當A,B兩點分別在直線l的兩側時,還應該有兩條.∴2a小於A,B間距離∵|AB|=(1−0)2+(63−53)2=2∴0<2a<2,∴0<a<1故答案為0<a<1.
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