问答题
参考答案:
x2-y2-x-y+z=0
问答题x2-y2-x-y+z=0
2x2-2xy+3/2y2-2x=0
问答题2x2-2xy+3/2y2-2x=0
证明:抛物线满足I1I3<0.
问答题证明:抛物线满足I1I3<0.