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Mathematics, 28.11.2021 14:00 aboatright7410
Cho tm giác ABC vuông tại A ( AB < AC). Gọi I là trung điểm của BC. Qua I vẽ IM ⊥ AB tại M, và IN ⊥ AC tại N.
a) Chứng minh AMIN là hình chữ nhật.
b) Gọi D là điểm đối xứng của I qua N. Chứng minh ADCI là hình thoi.
c) Đường thẳng BN cắt DC tại K. Chứng minh:
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Cho tm giác ABC vuông tại A ( AB < AC). Gọi I là trung điểm của BC. Qua I vẽ IM ⊥ AB tại M, và IN...
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