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DA
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DH
15 tháng 11 2021 lúc 21:58

Giống mình làm

 

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V2
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VA
24 tháng 12 2022 lúc 10:59

\(AB=\sqrt{\left(-2-2\right)^2+\left(-1+2\right)^2}=\sqrt{17}\)

\(AC=\sqrt{\left(1-2\right)^2+\left(2+2\right)^2}=\sqrt{17}\)

Vậy tam giác ABC cân tại A.

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MN
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NT
10 tháng 10 2023 lúc 9:08

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TP
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KC
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EY
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PB
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CT
26 tháng 12 2017 lúc 17:35

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PB
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CT
16 tháng 10 2018 lúc 6:32

Đáp án C

Ta có: 

Từ điểm D kẻ đường thẳng song song với AC, cắt cạnh AB tại điểm E. Từ D kẻ đường thẳng song song với AB cắt cạnh AC tại F. Do AD là đường phân giác trong của tam giác ABC nên ta suy ra AEDF là hình thoi.

 

Đặt AE=AF=k. Ta có:

là một vectơ chỉ phương của đường thẳng AD. Từ đó suy ra C là khẳng định đúng.

Ta cũng lưu ý rằng khẳng định A sai, do tam giác ABC không cân tại đỉnh A.

 

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H24
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TD
15 tháng 6 2022 lúc 20:31

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H24
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