Ta cosME⊥AC,MF⊥BH→MF//HE,ME//FH→MF=HEME⊥AC,MF⊥BH→MF//HE,ME//FH→MF=HE(tính chất đoạn chắn )
Kẻ DG//AC,G∈BC→ˆDGB=ˆACB=ˆABC→ΔDBGDG//AC,G∈BC→DGB^=ACB^=ABC^→ΔDBGcân tại D

→DG=DB→DG=DB 

Ta có MD⊥AB,MF⊥BF→ˆBDM=ˆBFM=90oMD⊥AB,MF⊥BF→BDM^=BFM^=90o

Mà ˆFMB=ˆACB=ˆABC=ˆDBMFMB^=ACB^=ABC^=DBM^

→ΔDMB=ΔFBM(g.c.g)→BD=FM→BD=HE→DG=CK(=HE)→ΔDMB=ΔFBM(g.c.g)→BD=FM→BD=HE→DG=CK(=HE)

Gọi DK∩BC=I→ˆGDI=ˆIKC,ˆDGI=ˆICK(DG/AC)DK∩BC=I→GDI^=IKC^,DGI^=ICK^(DG/AC)

Kết hợp DG=CK→ΔDIG=ΔKIC(g.c.g)→ID=IK→BCDG=CK→ΔDIG=ΔKIC(g.c.g)→ID=IK→BCđi qua trung điểm của DK

Sau thắng lợi trong cuộc khởi nghĩa Lam Sơn, quân Minh bị quét sạch ra khỏi bờ cõi. Năm 1428, Lê Lợi lên ngôi hoàng đế lấy hiệu là Thuận Thiên, khôi phục quốc hiệu Đại Việt, đóng đô ở Thăng Long ( Hà Nội ngày nay)=> Nhà Lê sơ chính thức được thành lập.

I love city life. First modern.Second, convenient.Third, networking opportunities.In conclusion, advanced infrastructure.

I love city life. First modern.Second, convenient.Third, networking opportunities.In conclusion, advanced infrastructure.

I love city life. First modern.Second, convenient.Third, networking opportunities.In conclusion, advanced infrastructure.

I love city life. First modern.Second, convenient.Third, networking opportunities.In conclusion, advanced infrastructure

I love city life. First modern.Second, convenient.Third, networking opportunities.In conclusion, advanced infrastructure.

I love city life. First modern.Second, convenient.Third, networking opportunities.In conclusion, advanced infrastructure

I love city life. First modern.Second, convenient.Third, networking opportunities.In conclusion, advanced infrastructure.

I love city life. First modern.Second, convenient.Third, networking opportunities.In conclusion, advanced infrastructure.