1:chữ số 9 trong số 14,209 thuộc hàng nào 2:phân số 2/5 viết dưới dạng số thập phân là 4:25% của 34,6kg là 5:tỉ số phần trăm của 37 và 42 là 6:chu vi của bánh xe đạp là 1,884m. diện tích của bánh xe đạp là bài 2: a. 8km 362m=........km c. 1 phút 30 giây =.........phút b. 15kg 287g=.........kg d. 3cm* 25mm*=........cm*

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