Bạn chưa đăng nhập. Vui lòng đăng nhập để hỏi bài

Những câu hỏi liên quan
Đỗ Vũ Nhật Anh
Xem chi tiết
Duy Nghĩa Hoàng
15 tháng 11 2021 lúc 21:58

Giống mình làm

 

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

https://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.htmlhttps://olm.vn/hoi-dap/detail/239868952049.html

Bà HOÀng Thả ThÍnh
Xem chi tiết
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)

Khách vãng lai đã xóa
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

The Moon
Xem chi tiết
The Moon
20 tháng 8 2021 lúc 17:54

GẤP LẮM Ạ,NGAY BÂY GIỜ Ạ

LynnLee
Xem chi tiết
Nguyễn Lê Phước Thịnh
23 tháng 12 2021 lúc 13:14

a: Áp dụng tính chất của dãy tỉ số bằng nhau, ta được:

\(\dfrac{a}{1}=\dfrac{b}{3}=\dfrac{c}{5}=\dfrac{a+b+c}{1+3+5}=\dfrac{180}{9}=20\)

Do đó: a=20; b=60; c=100

Vậy: ΔABC là tam giác tù

Anh Nguyễn Mai
Xem chi tiết
Nguyễn Linh Chi
22 tháng 2 2020 lúc 10:17

Câu hỏi của Nguyễn Vũ Thu Hương - Toán lớp 7 - Học toán với OnlineMath

Khách vãng lai đã xóa
Phương Thảo
Xem chi tiết
Trịnh Việt Dũng
15 tháng 6 2022 lúc 20:29

chịu hoi =))))))

 

Trịnh Việt Dũng
15 tháng 6 2022 lúc 20:29

em mới học lớp 7 hà

năm nay lên lớp 8 =)))))

Nguyễn Thảo My
14 tháng 1 2023 lúc 21:25

1)Ta có: \(S_{ABC}=\dfrac{1}{2}AB.AC.\sin A\)

\(\Leftrightarrow8=\dfrac{1}{2}\times4\times5\times sinA\)

\(\Leftrightarrow\sin A=0,8\)

Lại có: \(\left(\sin A\right)^2+\left(\cos A\right)^2=1\Leftrightarrow\cos A=0,6.\)

Áp dụng định lí hàm số cosin:

\(BC^2=AB^2+AC^2-2AB\times AC\times\cos A\)

\(\Leftrightarrow BC^2=4^2+5^2-2\times4\times5\times0,6=17\)

\(\Leftrightarrow BC=\sqrt{17}.\)

2) Trong \(\Delta ABC\) có: \(g\text{ó}cA+g\text{óc}B+g\text{óc}C=180^o\)

=> BAC=75o.

Áp dụng định lí hàm số sin:

\(\dfrac{AB}{\sin C}=\dfrac{BC}{\sin A}\Leftrightarrow\dfrac{3}{\sin45^o}=\dfrac{BC}{\sin75^o}\)

\(\Leftrightarrow BC=\dfrac{3+3\sqrt{3}}{2}\).

 

 

Trần Thị Ngọc Như
Xem chi tiết
Trần Hương
8 tháng 1 2016 lúc 21:22

dang tung bai di ban 

nhin thay ngai qua

Huyền Anh
Xem chi tiết
❤️ Jackson Paker ❤️
3 tháng 7 2021 lúc 10:48

\(\Delta DEF\) cho ta \(\widehat{D}+\widehat{E}+\widehat{F}=180^0\)

                   \(\Rightarrow\widehat{D}=180^0-\left(\widehat{E}+\widehat{F}\right)\)

                   \(\Rightarrow\widehat{D}=180^0-\left(70^0+60^0\right)=180^0-130^0=50^0\)

\(Xét\) \(\Delta ABCvà\Delta DEFcó\)

\(\widehat{A}=\widehat{D}\left(=50^0\right)\)

AB=DE

AC=DF

\(\Rightarrow\Delta ABC=\Delta DEF\left(c-g-c\right)\)

Vậy \(\Delta ABC=\Delta DEF\)

 

my nguyen
Xem chi tiết
Yen Nhi
12 tháng 5 2021 lúc 13:00

* Theo mình thì phần a) Góc A = 90 độ sẽ hợp lý hơn chứ. Vậy nên mình sẽ làm theo cả hai góc A 90 độ và 80 độ nhé ( Nhưng bài của mình phần b) sẽ theo góc A = 90 độ )

a)

Góc A = 80 độ thì sẽ có thể tam giác ABC là tam giác cân, tam giác ⊥ tại B hoặc C, tam giác ABC là tam giác tù hoặc tam giác nhọn

Góc A = 90 độ thì tam giác ABC là tam giác vuông tại A

b) 

Theo phần a), ta có: Tam giác ABC cân tại A

=> Góc B = góc C = ( 180 độ - 70 độ ) : 2 = 55 độ

Khách vãng lai đã xóa