更新：奉送两道JJ: 12。14，感谢CD,北美 M 5*,V4*，7**

Not really sure.

For math, 90% of the questions are new to me, but for V, a little bit more jj.

請大大分享JJ

感謝

閱讀等等

X is positive,is x>y?

1)xy<0

2)x>y+1

D?????

感谢楼主即使一题也很感激……^-^