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nganunni
2 năm trước
a) Một hình thang có diện tích là 20m vuông, đáy lớn là 55dm và đáy bé là 45dm. Tính chiều cao của hình thang. b) Tính trung bình cộng hai đáy của một hình thang, biết rằng diện tích hình thang bằng 7m vuông và chiều cao bằng 2m.
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