Gọi số cần tìm là a
Ta có 10a-a=648
9a =648
a =72
Vậy a=72
Gọi số cần tìm là: a
Khi đó 10a-a=648
9a=648
a=648:9
a=72
Ai tích m,k mk sẽ tích lại
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