0.9+0.99+0.999+… +0. (100 9)

0.9+0.99+0.999+… +0. (100 9)

0.9+0.99+0.999+… +0. (100 9)
=1 + 1 + 1 +. + 1-0.1-0.01 -. - 0. (99 zeros) 1
=100-0.111 (100 pieces in total)
=99.888 (a total of 99 8) 9