Question

[Stella Yamamoto]

a)1/2+4/6+1/12+...+1/(x+1).x=2016/2017

b)5/8/17:x+(-4/17):x+3/1/5:17/1/3=4/11

          giải hộ mk nha các bn mk sẽ k mk thề

Answer 1

[Nguyễn Đức Minh]

ban vt sai dau bai roi phai la 

1/2+1/6+1/12+....+1/(x+1).x=2016/2017

1/1.2+1/2.3+1/3.4+.....+1/x.(x+1)=2016/2017

1-1/2+1/2-1/3+......+1/x-1/x+1=2016/2017

1-1/x+1=2016/2017

1/x+1=1-2016/2017

1/x+1=1/2017

=>x+1=2017

=>x=2016

b)

85/8:x+(-4)/17:x+15:51=4/11

85/8:x+(-4)/17:x=13/187

1413/136:x=13/187

x=15543/104