Bài `1:`
`216abc = 200000 + 10000 + 6000 + a00 + b0 + c`
`ab103 = a0000 + b000 + 100 + 3`
`ab04c1= a00 000 + b0 000 + 400 + c0 + 1`
`1abc035 = 1 000 000 + a00 000 + b00 000 + c000 + 30 + 5`
`3ab23cd = 3 000 000 + a00 000 + b0 000 + 2000 + 300 + c0 + d`
`62ab0 = 6000 + 2000 + a00 + b00`
Câu `2:`
`234 = CCCCXXXIV`
`46 = XXXXVI`
`23 = XXIII`
`2022 = MMXXII`
`307 = CCCCCCVII`
`45 = XLV`