Question

若曲線y=xy²-x²y-2x，所表示的曲線（    ）

A.關(guān)于y軸對(duì)稱                                B.關(guān)于直線x+y=0對(duì)稱

C.關(guān)于原點(diǎn)對(duì)稱                                D.關(guān)于直線x-y=0對(duì)稱

Answer 1

C

解析：以-x代x，同時(shí)以-y代y方程不變.