Đáp án+Giải thích các bước giải:
x/1.2:2+x/2.3:2+x/3.4:2+x/4.5:2+....+x/4041.4042:2=4041
2x/1.2+2x/2.3+2x/3.4+....+2x/4041.4042=4041
2x(1/1.2+1/2.3+1/3.4+...+1/4041.4042)=4041
2x(1/1-1/2+1/2-1/3+...+1/4041-1/4042)=4041
2x(1/1-1/4042)=4041
2x.(4041/4042)=4041
4041x/2021=4041
x=4041.2021:4041
x=2021