Question

已知B（-4,-1）,BC⊥y轴于点C,点A在y轴上,AC比CB比BA=3比4比5,点p从点C出发,沿CBA运动到点A,

Answer 1

1 A(0,2)或(0,-4)

2.4-2t (0＜t≤2)

2(t-2) (2＜t≤4.5)

3.P在BC上时,CP=4/3时 即t=2/3

P在AB上时,由相似三角形求得当高为4/3时,AP=5/3

求得t=11/3