1/15+1/35+1/63+1/99+1/143
=2/21+1/63+1/99+1/143
=1/9+1/99+1/143
=4/33+1/143
=5/39

   1/15 + 1/35 + 1/63 + 1/99 + 1/143
= 35/ 525 + 15/525 + 1/63 + 1/99 + 1/143
= 50/525 + 1/63 + 1/99 + 1/143
= 3150/33075 + 525/33750 + 1/99 + 1/43
=3675/33075 + 1/99 + 1/43
= 363825/3274425 + 33705/3274425 + 1/43
= 397530/3274425 + 1/43
= 17093790/468242775 + 3274425/468242775
= 17418468242775
chấm 5 đ lượt like và 4000 xu cho mik nha.
= 

   1/15 + 1/35 + 1/63+ 1/99 + 1/143
= 2/21 + 1/63 + 1/99 + 1/143
= 1/9 + 1/99 + 1/143
= 4/33 + 1/143
= 5/39

1/15+1/35+1/63+1/99+1/143=5/39

 Đáp án:
=5/39

1/15+1/35+1/63+1/99+1/143
=2/21+1/63+1/99+1/143
=1/9+1/99+1/143
=4/33+1/143
=5/39

5/3 nha em trai..........