Câu 14: Học sinh lớp 6A khi học thể dục có thể xếp thành 4 hàng, 5 hàng, 8 hàng thì vừa đủ. Tính số học sinh của lớp biết lớp không vượt quá 50 học sinh. Câu 15: Tìm số tự nhiên nhỏ nhất khác 0 chia hết cho 36 và 90. Câu 16: Tìm số tự nhiên A biết 276 chia A dư 36, 453 chia A dư 21. Câu 17: Dùng 6, 0, 5 lập được bao nhiêu số có 3 chữ số chia hết cho 5.

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