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Stellar Phan
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Trang Đoàn
30 tháng 9 2016 lúc 10:49

Sao ko có gì vậy ạ 

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Trang Đoàn
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Trang Đoàn
29 tháng 9 2016 lúc 18:34

Toán lớp 7

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Nguyễn Mạnh Đạt
14 tháng 10 2016 lúc 19:36

Toán lớp 7

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Nguyễn Thế Bảo
29 tháng 9 2016 lúc 18:30

bài 1:

a) Gọi số đo các góc của tam giác trên là x; y; z; ta có:

x = y = z theo đề bài

x  + y + z = 180 độ (tổng 3 góc trong tam giác)

=> x + x + x = 180 độ

x = 60 độ

vậy số đo 3 góc của tam giác trên cùng bằng 60 độ

b) số đo các góc ngoài của tam giác trên cùng bằng 180 độ - 60 độ = 120 độ

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nhật minh
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ILoveMath
1 tháng 1 2022 lúc 9:43

d

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Thư Phan
1 tháng 1 2022 lúc 9:43

D

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Pham Trong Bach
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Cao Minh Tâm
29 tháng 5 2019 lúc 11:12

Xét tam giác ABC có

Giải bài 5 trang 108 Toán 7 Tập 1 | Giải bài tập Toán 7

Vậy tam giác ABC là tam giác vuông.

Xét tam giác DEF có:

Giải bài 5 trang 108 Toán 7 Tập 1 | Giải bài tập Toán 7

Vậy tam giác DEF là tam giác tù.

Xét tam giác HIK:

Giải bài 5 trang 108 Toán 7 Tập 1 | Giải bài tập Toán 7

Nhận thấy

Giải bài 5 trang 108 Toán 7 Tập 1 | Giải bài tập Toán 7

Vậy tam giác HIK là tam giác nhọn.

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

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nonk_Kakashi
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Lê Thanh Huyền
2 tháng 3 2018 lúc 20:11
Bạn viết không hoàn chỉnh thì sao trả lời đc?
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nonk_Kakashi
2 tháng 3 2018 lúc 20:13

Không hoàn chỉnh ở chỗ nào?

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Nguyễn Thu Trang
2 tháng 3 2018 lúc 20:15

1sai    2đúng

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nonk_Kakashi
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Nguyễn Văn Anh Kiệt
2 tháng 3 2018 lúc 20:23

Đúng:3( quá rõ rồi @@),5,6,8

Sai:1,2,4,7.

Cái nào chưa hiểu để mik giải thích

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nguyen minh chau
22 tháng 2 2021 lúc 14:59

Khẳng định đúng : 3 , 5 , 6 , 8

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 Khách vãng lai đã xóa
nonk_Kakashi
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Sách Giáo Khoa
Xem chi tiết
Tuyết Nhi Melody
20 tháng 4 2017 lúc 12:01

Tam giác vuông ABC ; Tam giác tù DEF; Tam giác nhọn HIK

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Lưu Hạ Vy
20 tháng 4 2017 lúc 12:07

Tam giác vuông ABC; Tam giác tù DEF; Tam giác nhọn HIK.

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Lý Tùng Lâm
4 tháng 11 2018 lúc 9:04

Tam giác ABC là tam giác vuông

Tam giác DEF là tam giác tù

Tam giác HIK là tam giác nhọn

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Lê Kim Chi
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Ann Ann
14 tháng 12 2016 lúc 22:09

vì đại lượng x tỉ lệ thuận với đl y theo hệ số tỉ lệ a

\(\Rightarrow x=y.k\)\(\left(a\ne0\right)\)\(\left(1\right)\)

thay x=6,y=3 vào (1) ta có

6=3.k=>k=2

bd x theo y: x=y.2

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tien le
14 tháng 12 2016 lúc 22:16

1 cạnh góc vuông và góc nhọn của tam giác vuông này chứ ko phải tam giác này theo hệ quả 1 bài trg' hợp bằng nhau thứ 3 của tam giác góc-cạnh-góc(g.c.g)

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