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free fire
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tamanh nguyen
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Nguyễn Hoàng Minh
2 tháng 12 2021 lúc 15:50

\(1,HC=\dfrac{AH^2}{BH}=\dfrac{256}{9}\\ \Rightarrow AB=\sqrt{BH\cdot BC}=\sqrt{\left(\dfrac{256}{9}+9\right)9}=\sqrt{337}\\ 2,BC=\sqrt{AB^2+AC^2}=10\left(cm\right)\\ \Rightarrow BH=\dfrac{AB^2}{BC}=6,4\left(cm\right)\\ 3,AC=\sqrt{BC^2-AB^2}=9\\ \Rightarrow CH=\dfrac{AC^2}{BC}=5,4\\ 4,AC=\sqrt{BC\cdot CH}=\sqrt{9\left(6+9\right)}=3\sqrt{15}\\ 5,AC=\sqrt{BC^2-AB^2}=4\sqrt{7}\left(cm\right)\\ \Rightarrow AH=\dfrac{AB\cdot AC}{BC}=3\sqrt{7}\left(cm\right)\\ 6,AC=\sqrt{BC\cdot CH}=\sqrt{12\left(12+8\right)}=4\sqrt{15}\left(cm\right)\)

dsfdsf
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15 tháng 6 2022 lúc 20:31

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Tiến Phạm
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Phạm Trọng An Nam
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tran duc huy
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Đỗ Vũ Nhật Anh
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Duy Nghĩa Hoàng
15 tháng 11 2021 lúc 21:58

Giống mình làm

 

Pham Trong Bach
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Cao Minh Tâm
5 tháng 2 2017 lúc 18:19

Đáp án A

Em có: SA ⊥ ABC  tại A

=> A là hình chiếu vuông góc của S trên (ABC)

=> AB là hình chiếu vuông góc của SB trên (ABC)

Pham Trong Bach
Xem chi tiết
Cao Minh Tâm
17 tháng 8 2017 lúc 8:26

Đáp án: A

Nguyễn Văn Thùy
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Lê Quỳnh Mai
31 tháng 7 2015 lúc 15:42

http://truongthhongquang.violet.vn/entry/show/entry_id/7754407