tim so lon nhat va so nho nhat trong cac so tu nhien co dang 1x2y3z4 chia het cho 7
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k co so tu nhien lon nhat nha
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vì trong các số chỉ gồm chữ số 7 mà chia hết cho 9 thì phải có 9 lần số 7 nên số đó là 777777777
nếu thấy đúng thì tick cho Ánh nhé!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!