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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

 

Tiến Phạm
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The Moon
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The Moon
20 tháng 8 2021 lúc 17:54

GẤP LẮM Ạ,NGAY BÂY GIỜ Ạ

Khánh Linh Bùi
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dsfdsf
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Trịnh Việt Dũng
15 tháng 6 2022 lúc 20:31

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đào khánh lâm
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Nguyễn Lê Phước Thịnh
10 tháng 3 2022 lúc 21:53

Bài 1: 

a: Xét ΔABC có \(AC^2=AB^2+BC^2\)

nên ΔABC vuông tại B

b: XétΔABC có BC<AB<AC

nên \(\widehat{A}< \widehat{C}< \widehat{B}\)

Pham Trong Bach
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Cao Minh Tâm
8 tháng 11 2018 lúc 17:36

Gọi tọa độ điểm H(a;b)

Ta có:  A H → = a + 1 ; b − 1 ,   B H → = a ; b − 2 ,   B C → = 1 ; − 1 ,   A C → 2 ; 0

Do H là trực tâm tam giác ABC nên:

A C → . B H → = 0 B C → . A H → = 0 ⇒ 2. a + 0. b − 2 = 0 1. a + 1 − 1. b − 1 = 0 ⇒ a = 0 b = 2

Vậy H (0; 2).

Chọn A

Hòng
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Lionel Messi
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Lê Quynh Nga
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