x No Plagiarism!XqCwzDY8atUQRYo7HBChposted on PENANA 坐標平面上,二次函數y=-x+6x-9的圖形的頂點為A,且此函數圖形與y軸交於B 點。若在函數圖形上取一點C ,在x軸上取一點D ,使得四邊形ABCD 為平行四邊形,則D 點坐標為何? 15.158.61.8ns 15.158.61.8da2