Bài 3: Đường kính của bánh xe đạp là 65cm. Hỏi người đi xe đạp đi được bao nhiêu mét nếu bánh xe lăn trên mặt đất được 1000 vòng? Bài 4: Một thửa ruộng hình thang có đáy lớn 200m, đáy bé bằng 4/5 đáy lớn và hơn chiều cao 10m.Trung bình cứ 100m 2 thu hoạch được 60 kg thóc. Hỏi trên thửa ruộng đó người ta thu hoạch được bao nhiêu tạ thóc?

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