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Dangthai
2 năm trước
nếu ta nhân số 12345679 với một số a bất kì có một chữ số , rồi nhân kết quả đó với 9 thì ta được số có 9 chữ số mỗi chữ số đều là a chẳng hạn khi a= 3 thì 12345679 nhân 3 = 37037037 37037037 nhân 9 = 333333333 Em hãy giải thích tại sao
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