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Mathematics, 09.09.2021 05:50 charati3923

Cho tam giác ABCD có phân giác trong của góc A và góc B cắt nhau tại E sao cho DE=DA: chứng minh a) các tam giác ABC và EDC bằng nhau
b) AC là phân giác góc A

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Cho tam giác ABCD có phân giác trong của góc A và góc B cắt nhau tại E sao cho DE=DA: chứng minh a...
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