Question

[Lê Đức Nam]

Giup mk , mk sẽ kết bạn nhé :

B=6/1.3.5 + 6/3.7.9 + 6/7.9.13 + 6/9.13.15 + 6/13.15.19

Answer 1

[pham duc hung]

B=6/1.3.5+6/3.7.9+6/7.9.13+6/9.13.15+6/13.15.19

 =2/5+2/63+2/273+2/585+2/1235

 =886/1995