Gọi số đó là ab
ab = (a+b)9
a.10+b.1=a.9 + b.9
a.10 - 9.a = b.9 - b.1
a.1 = b.8
=> a = 8 ; b = 1
Vậy số đó 81
81 nha !
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hay tim so co 3 chu so biet rang so do gap 3 lan tich cac chu so cua no!!!
aj giup mk vs dua ra cach lm nhan ;(
