已知三个点(x0,y0),(x1,y1),(x2,y2)求f(x)过这三点的二次拉格朗日插值多项式L2(x）=___,计算高次插值多项式时可能出现___现象.(本题6.0分)

答案: (1)L2= (x-x1)(x-x2)/(x0-x1)(x0-x2)y0+(x-x0)(x-x2)/(x1-x0)(x1-x2)y1+(x-x0)(x-x1)/(x2-x0)(x2-x1)y2; (2) 龙格;