1.當k>0,b>0時,直線y=kx+b不經過甚麼象限?
2.已知-(π/2)<x<0, sinx+cosx=0.2, 求sinx-cosx.
收錄日期: 2021-05-02 10:41:20
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20120316000010KK04557