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lethiphuongvi1707
2 năm trước
Một mảnh đất hình thang có độ dài đáy lần lượt là 15.6m, 25.75m. Chiều cao là giữa hiệu của đáy lớn và đáy bé. Hỏi: a, Diện tích của thửa ruộng đó bằng bao nhiêu m2 ? b, Nếu phải dùng 10% diện tích để làm bờ ruộng thì diện tích trồng lúa còn lại bao nhiêu m? c, Số lượng thóc đã thu được bao nhiêu kg biết cứ 1m2 thủ được 0,6 kg thóc ?
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