C1: x^2 + y^2 +Dx + Ey + F = 0
C2: x^2 + y^2 +Dx + Ey + F = 0
family of circle :::
(x^2 + y^2 +Dx + Ey + F)+k(x^2 + y^2 +Dx + Ey + F = 0)
*我用了顏色區分..希望看得明白..
我想問點解藍色果個C2係呢個case唔係family of circle既..?
佢cut Y同Z架wo....我仲係好唔明啦..
thz..
另外..我諗到一條問題..
就係牙sir你上次講slope=無限..就係=y軸啊..?
但y軸唔係=slope undefined咩..
因為y軸係條直線呀ma..slope直既話個數係undefined..點解係話無限..?
thz very much~~