1, Cho hình bình hành ABCD có D(-6,-6)
Đường trung trực của CD có phương trình 2x+3y+17=0
Đường phân giác góc ^BAC có phương trình 5x+y-3=0 
Xác đinh tọa độ các đỉnh còn lại?

2, Cho hình thang cân ABCD, AB<CD, AB//CD, A(0,2)
I là giao 2 đường chéo. I ∈ x+y-4=0 
Cho B(-2,-2), ^AID = 45 độ 
Tìm tọa độ các đỉnh còn lại?

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