Đáp án:
1/3+1/6+1/10+.....+2/x(x+1)=2016/2017
1/2.[1/3+1/6+1/10+.....+2/x(x+1)]=1/2.2016/2017
1/6.1/12+1/20+....................1/x.(x+1)=1008/2017
1/2.3+1/3.4+1/4.5+...........+1/x-1/x-1=1008/2017
1/2-1/3+1/3-1/4+.............+1/x-1/x-1=1008/2017
1/2-(1/3-1/3)-................................-(1/x-1/x)-1/x-1=1008/2017
1/2-0-.-...........-0-1/x-1=1008/2017
1/2-1/x-1=1008/2017
2017/5034-1/x-1=2016/5034
1/x-1=2017/5034-2016/5034
1/x-1=1/5034
=>x-1=5034
x=5034+1=5035
Vậy x=5035
Cho mình xin hay nhất về cho nhóm ạ
Thank you very much