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Mathematics, 20.06.2021 20:50 abby6628

Cho tam giác ABC có góc b=60 độ vẽ phân giác BD từ A vẽ 1 đường thẳng vuông góc với BD cắt BD tại H cẮt AC tại E, chứng minh rằng tam giác ABE đều và Tam giác ADE cân

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Cho tam giác ABC có góc b=60 độ vẽ phân giác BD từ A vẽ 1 đường thẳng vuông góc với BD cắt BD tại H...

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