49/303 chắc chắn lun mình giải rùi tick nha
TL
Tui nghĩ = 49/303
Hok tốt
1\15+1\35+1\63=1\99+.....1\9999
1/15 + 1/35 + 1/63 + 1/99 + ....................................+ 1/9999
1/15+1/35+1/63+1/99+...+1/9999=
1/15 + 1/35 + 1/63 +1/99 + ........ + 1/9999 = ?
1/15+1/35+1/63+1/99+.....1/9999
1/15+1/35+1/63+1/99+..................+1/9999
1/15+1/35+1/63+1/99+...1/9999
1/15/+ 1/35 + 1/63+ 1/99+ ...+1/9999
A=[1/15+1/35+1/63+1/99+...+1/9999]
