A點和B點在拋物線y=AX^2BXC,所以Y1=AX^1^2BX1C,①...Y2=AX22BX2C.②①-②,得Y1-y2。1、已知拋物線過兩點,求a,b,c的范圍?A點和B點在拋物線y=AX^2BXC,所以Y1=AX^1^2BX1C,①...Y2=AX22BX2C.②①-②,得Y1-y2。{1。...