nguyenduykhang116200 nguyenduykhang116200

30-12-2022
Mathematics

contestada

Cho tam giác ABC vuông tại A,đường trung tuyến AD. Gọi E là điểm đối xứng của D qua AB
a) chứng minh DE song song AC
b) chứng minh tứ giác ADBE là hình thoi
C) Tìm điều kiện của tam giác ABC để tứ giác ADBE là hình vuông

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