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The largest 3-digit number is 999. To check if it is a multiple of 3, you can sum the digits: 9 + 9 + 9 = 27, which is divisible by 3. Therefore, 999 is the largest 3-digit number that is a multiple of 3.
9 999 999 999 999 999 999 999 999 la puterea 12= 1,0 × 10300
111
999 + 999/999 = 1000
99 999 999 980 000 000 001