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Trịnh Việt Dũng
15 tháng 6 2022 lúc 20:31

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Bà HOÀng Thả ThÍnh
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Dương Mạnh Quyết
21 tháng 12 2021 lúc 10:21

bài 2:

ta có: AB<AC<BC(Vì 3cm<4cm<5cm)

=> góc C>góc A> góc B (Các cạnh và góc đồi diện trong tam giác)

Bài 3:

*Xét tam giác ABC, có:

       góc A+góc B+góc c= 180 độ( tổng 3 góc 1 tam giác)

hay góc A+60 độ +40 độ=180độ

  => góc A= 180 độ-60 độ-40 độ.

  => góc A=80 độ

Ta có: góc A>góc B>góc C(vì 80 độ>60 độ>40 độ)

        => BC>AC>AB( Các cạnh và góc đối diện trong tam giác)

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Lưu Nguyễn Hà An
15 tháng 2 2022 lúc 9:04

bài 2:

ta có: AB <AC <BC (Vì 3cm <4cm <5cm)

=> góc C>góc A> góc B (Các cạnh và góc đồi diện trong tam giác)

Bài 3:

*Xét tam giác ABC, có:

       góc A+góc B+góc c= 180 độ( tổng 3 góc 1 tam giác)

hay góc A+60 độ +40 độ=180độ

  => góc A= 180 độ-60 độ-40 độ.

  => góc A=80 độ

Ta có: góc A>góc B>góc C(vì 80 độ>60 độ>40 độ)

        => BC>AC>AB( Các cạnh và góc đối diện trong tam giác)

HT mik làm giống bạn Dương Mạnh Quyết

Đỗ Vũ Nhật Anh
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Duy Nghĩa Hoàng
15 tháng 11 2021 lúc 21:58

Giống mình làm

 

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

GẤP LẮM Ạ,NGAY BÂY GIỜ Ạ

Khách vãng lai
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phung tuan anh phung tua...
1 tháng 4 2022 lúc 20:39

C

Tạ Tuấn Anh
1 tháng 4 2022 lúc 20:39

C

Chuu
1 tháng 4 2022 lúc 20:39

C

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

Tiến Phạm
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Kimian Hajan Ruventaren
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vu thi kim oanh
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vu thi kim oanh
7 tháng 11 2017 lúc 19:10

đề bài sai rồi!

phan đỗ hoàng linh
1 tháng 12 2017 lúc 13:15

ta có tam giác ABC= tam giác HIK (1)

         tam giác ABC=tam giác HIK (2)

   Từ (1) và (2) => tam giác ABC=tam giác ABC => đpcm

cho mik nha

IS
22 tháng 2 2020 lúc 19:58

Ta có:  tam giác ABC=tam giác DEF (1)
và tam giác DEF = tam giác HIK       (2)
Từ (1) và (2) =>  tam giác ABC = tam giác HIK

học tốt

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Trà My
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