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dichkinhi2k8
2 năm trước
Cho hình thang ABCD ( góc A = góc D= 90 độ ), có CD = 2AB. Kẻ DH vuông góc với AC ( H ∈ AC ), N là trung điểm của CH. Chứng minh BN⊥DN Mọi người ơi giúp mik vs ạ :((( huhu Mik đang cần rất gấp ạ
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