→ wayn2008 :解聯立 利用第三象限解出m的範圍即可 12/27 17:07
→ brian821117 :還是不太懂@@ 12/27 17:10
→ ejialan :Cramer's rule 12/27 17:19
→ brian821117 :喔喔感恩<(_ _)> 12/27 17:30
→ wayn2008 :克拉瑪跟直接聯立差不多.. 12/27 17:48
推 wichanm :(m,3,-2)×(3,m,1)=(3+2m,-6-m,m^2-9) 12/27 21:01
→ wichanm :(3+2m)/(m^2-9) < 0 12/27 21:06
→ wichanm :(-6-m)/(m^2-9) < 0 12/27 21:08
→ wichanm :上面兩式聯立求得m = -4 or -5 12/27 21:09
→ wichanm :上面兩式分別為交點的x座標與y座標 12/27 21:15