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2 năm trước
Cho ∆ABC ∆DEF , biết AB = 5cm, DE = 9cm. a. Viết tên các cặp góc bằng nhau b. Tìm tỉ số đồng dạng c. Tính P và P’. Với P và P’ lần lượt là chu vi của ∆ABC và ∆DEF, biết P’ + P = 28
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