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nguyenvanvinhds1978
1 năm trước
Bài 2 viết 5 phân số bằng phân số 3/4 Bài 4 một thửa ruộng hình bình hành có cạnh đáy là 70 m chiều cao kém cạnh đáy 20 m A/ tính diện tích thửa ruộng hình bình hành đó B trên thửa ruộng người ta cấy lúa trung bình cứ 100 mét vuôngthu hoạch được 60 kg thóc hỏi thửa ruộng đó người ta thu hoạch được bao nhiêu tạ thóc ?
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