1.chữ số 9 trong số thập phân nào dưới đây có giá trị 9/1000 a.119,08 b.118,9 c.20,29 d. 18,009 2.chữ sô thích hợp điền vào ô trống để số 201 chia hết cho 2;3;5 a .0 b.3 c.5 d.6 3.7,05 dm2 - cm2 a. 0,705 b, 70,5 c, 705 d 7050 4. 6,2 giờ - a. 6 giờ 2 phút b, 6 giờ 12 phút c 6 giờ 20 phút d 6 giờ 30 phút 5. trong 20kg dung dịch muối có 0,4 kg muối .Tỉ lệ phần trăm của nước trong dung dịch nước muối đó là a 2% b. 98% c. 9,8% d. 80% 6. 4/11 : 2/5 7. cuối năm học vùa qua , trường A có tất cả 366 em đạt danh hiệu học sinh giỏi và học sinh tiên tiến , số học sinh tiên tiến nhiều hơn số học sinh giỏi là 92 em . Tính số học sinh giỏi , học sinh tiên tiến

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