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phamthithugiang30
2 năm trước
1Ba bạn Toán, Tuổi và Thơ có một số vở. Nếu lấy 40% số vở củaToán chia đều cho Tuổi và Thơ thì số vở của ba bạn bằng nhau. Nhưng nếu Toánbớt đi 5 quyển thì số vở của Toán bằng tổng số vở của Tuổi và Thơ. Hỏi mỗi bạncó bao nhiêu quyển vở ? 2 Cho A = 2004 x 2004 x ... x 2004 (A gồm 2003 thừa số) vàB = 2003 x 2003 x ... x 2003 (B gồm 2004 thừa số).Hãy cho biết A + B có chia hết cho 5 hay không ? Vì sao ?
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