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Phương Thảo
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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:

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

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

 

 

Hùng Nguyễn Đức
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Nguyễn Văn A
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Nguyễn Văn A
15 tháng 3 2021 lúc 18:07

Sao tôi viết câu hỏi nhưng chỉ hiển thị có 1 dòng

Cherry
15 tháng 3 2021 lúc 18:09

Xem ảnh nguồn

Nguyễn Văn A
15 tháng 3 2021 lúc 18:14

Câu hỏi đây mọi người giải giúo mình nhé. Xin cảm ơn

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Nguyễn Ngọc Anh Thư
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Đỗ Tuệ Lâm
22 tháng 12 2021 lúc 8:49

thiếu kìa

Nguyễn Văn A
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Cherry
15 tháng 3 2021 lúc 17:44

answer-reply-image

Diem Nhi
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Dat09
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Khanh Van Tran
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Nguyễn Lê Phước Thịnh
30 tháng 11 2021 lúc 19:52

Điểm I ở đâu vậy bạn?

Khanh Van Tran
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Nguyễn Lê Phước Thịnh
30 tháng 11 2021 lúc 19:59

Điểm I ở đâu vậy bạn?