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loga1991
2 năm trước
Một thửa ruộng hình thang có độ dài hai đáy lần lượt là 80,2m và 59,8m. Chiều cao ngắn hơn đáy bé 15,8m. a/tính diện thửa ruộng bằng mét vuông, ha. b/thửa ruộng cấy lúa cho năng suất 8,2 tấn/ha. Tính số thóc thửa ruộng thu hoạch được bằng kg.
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