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Quoc Tran Anh Le
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Kiều Sơn Tùng
17 tháng 9 2023 lúc 22:04

a) Tam giác ABC nhọn:

 

b) Tam giác ABC vuông tại A:

 

c) Tam giác ABC có góc A tù:

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

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Phong La
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Pham Trong Bach
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Cao Minh Tâm
11 tháng 10 2019 lúc 8:01

Ta có: AB → = (−a; b; 0) và  AC →  = (−a; 0; c)

Vì  AB → .  AC →  = a 2 > 0 nên góc BAC là góc nhọn.

Lập luận tương tự ta chứng minh được các góc  ∠ B và  ∠ C cũng là góc nhọn.

Trần Đàn
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Trần Đàn
14 tháng 8 2021 lúc 9:30

help meeeeeeeeeeee

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Nguyễn Đức Chung
14 tháng 8 2021 lúc 9:31

Làm sao mà vẽ đc?

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Gloomy Sunday
14 tháng 8 2021 lúc 9:34

vẽ kó quá 

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Nguyễn Thu Trang
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Cuong Nguyen
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Khoa Nguyễn
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Violympic em giỏi toán
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minhduc
10 tháng 12 2017 lúc 8:42

A B C D M 1 2 1 1

a, Xét \(\Delta MAB-\Delta MDC:\)

           \(\widehat{M_1}=\widehat{M_2}\)

           \(AM=MD\left(gt\right)\)

             \(BM=MC\left(gt\right)\)

\(\Rightarrow\)\(\Delta MAB=\Delta MDC\left(c.g.c\right)\)

b, Có \(\Delta MAB=\Delta MDC\left(cmt\right)\)

         \(\Rightarrow\widehat{A_1}=\widehat{D_1}\)

Hay AB // CD.

Nguyễn Nguyên Bá
10 tháng 12 2017 lúc 8:41

xét tam giác suy ra 2 góc slt bằng nhau

Violympic em giỏi toán
10 tháng 12 2017 lúc 8:44

CÒN CÂU C THÌ SAO BẠN

Nguyễn Nhất Linh
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Linh Kẹo
9 tháng 8 2016 lúc 10:38

TRỜI ! MỘT BÀI TOÁN BÙ ĐẦU BÙ ÓC

Hùng Nguyễn
11 tháng 8 2016 lúc 12:04

bài này lóp 7 hoc rù nhung quyen lop 7 nhình học giỏi lám đó

Đặng Phương Linh
23 tháng 11 2017 lúc 21:11

1.Cho tam giác ABC có số đo góc A,góc B,góc C tỉ lệ nghịch vs 3;4;6.Tính số đo các góc của tam giác ABC.

2.Cho tam giác ABC có số đo góc A,góc B,góc C tỉ lệ thuận vs 3;4;5.Tính số đo các góc của tam giác ABC.