(X2+2x+3)/(x+1) = (5-2)/(2-1)(X2+2x+3)/(x+1) = 3X2+2x+3 = 3x+3X2-x = 0X = 0或 1a的坐标为（1,3）或（2,6）
先采纳我，后吿诉你
