-18+(-17)-16-15+22+25+24+23-2021=(-18+22)+-17-16-15+25+24+23-2021
=4+-17-16-15+25+24+23-2021
=-44+25+24+23-2021=-1993
ok nha
- 18 + ( - 17 ) - 16 - 15 + 22 + 25 + 24 + 23 - 2021
= ( -18 +22) - (-17+23) - ( 16 + 24)-(15+ 25) -2021
= 4 - 6 - 40 - 40 -2021
= -2 - 0 - 2021 = 2023