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halinh1991
2 năm trước
Cho hình bình hành ABCD có đường chéo AC lớn hơn đường chéo BD, kẻ CH vuông góc với AD, CK vuông góc với AB a) CM: Tam giác CKH đồng dạng với tam giác BCA ( dùng kiến thức lớp 8) b) Tính Sakch biết góc BDA = 60 độ, AB= 4cm, AD= 5cm
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