Đáp án + Giải thích các bước giải:
`(120.13+2019.11+2020.12)(120.11-100.11-220)`
`=(120.13+2019.11+2020.12)(120.11-100.11-11.20)`
`=(120.13+2019.11+2020.12)[11(120-100-20)]`
`=(120.13+2019.11+2020.12)(11.0)`
`=(120.13+2019.11+2020.12).0`
`=0`
Chọn `C`