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khanhnguyenhq786
2 năm trước
Cho tam giác ABC vuông tại A đg cao AH a.Cho AB=24cm,AC=18cm.Tính HB,HC và góc B b.Gọi M,N là hình chiếu của H trên AB và AC. CM AM.AB+AN.AC=MN^2 c.CM Samn=sin^2B.sin^2C.Sabc
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