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Toán 10: Tam Giác: Nhận định đúng/sai
5 months ago
29
Cho tam giác ABC biết a=3cm,b=4cm,C ̂=30°
Mệnh đề Đúng/Sai
c^2=a^2+b^2-2ab cosC
c≈3,05 (cm)
cosA≈0,68
A ̂=77.2°
#TamGiac
#NhanDinhDungSai
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