Cho hinh lang tru tu giac $ABCD.A_1B_1C_1D_1$ co day la hinh binh hanh voi $AD=CD=BC=a ;AB=2a$. (P) qua A cat $BB_1, CC_1, DD_1$ lan luot tai M, N, P
a. Tu giac AMNP la hinh gi? So sanh AN va NP.
b. Chung minh giao diem cua AN va MP nam tren duong thang co dinh khi (P) thay doi.
c. BM +2DP = 2CN
AB khác CD thì ABCD làm sao co thế̉ là hình binh hành dc hả bạn –  GreenmjlkTea FeelingTea 23-11-12 11:43 AM

bị xóa vì bị trùng bởi Đức Vỹ 24-10-13 04:06 PM

Câu hỏi này có nội dung hoàn toàn trùng với câu hỏi đã có.

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