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Concuacucon1
2 năm trước
Một hình thang có đáy lớn 30 cm; đáy bé bằng 3/5 đáy lớn. Kéo dài đáy bé thêm một đoạn 0,3 dm và đáy lớn thêm một đoạn 0,7 dm thì diện tích tăng 20 cm2. Tính diện tích hình thang ban đầu ?
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