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thanhcr753
2 năm trước
Bài 7: Viết số thích hợp vào chỗ chấm: 5 phút12 giây =… giây 9 giờ 5 phút = … phút 7 thế kỉ5năm =… năm 8 tấn 55 kg = … kg 3 dm2 = …... cm2 79 dm2 25 cm2 = ….... cm2 54500 dm2 = …... m2 28 m2 6 cm2 = …...... cm2 Bài 8: Tính bằng cách thuận tiện nhất: a) 1235 + 306 + 694 + 265 b) 425790 + 2857 - 25790 + 5143 Bài 9: Chu vi của một thửa ruộng hình chữ nhật là 480m, chiều dài bằng 5/3 chiều rộng. a. Tính diện tích thửa ruộng hình chữ nhật. b. Trên thửa ruộng đó, người ta trồng cà chua. Trung bình cứ 100 m2 thu được 45 kg cà chua. Tính số cà chua thu được trên thửa ruộng đó.
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