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ngocthuy
2 năm trước
Cho hình thang ABCD (AB // CD) có AB < CD, AD = BC = AB, ∠BDC = $30^{o}$. Tính các góc của hình thang. Vẽ hình và làm cho mình. Không biết có sai đề không nhưng mình không làm được.
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