Calculation: 0.75 + 9.75 + 99.75 + 999.75 + 1 =? Detailed process! Help!

Calculation: 0.75 + 9.75 + 99.75 + 999.75 + 1 =? Detailed process! Help!

0.75＋9.75＋99.75＋999.75＋1
=1-0.25+10-0.25+100-0.25+1000-0.25+1
=（1000+100+10+1+1）-0.25x4
=1112-1
=1111
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9 + 99 + 999 +. + 999... 999 (100 9) =?

The numbers 1 to 9 are composed of 4-digit, 3-digit and 2-digit numbers without repetition, so that 4-digit divided by 2-digit equals 3-digit

4396 / 28 = 157
5346 / 27 = 198
5346 / 18 = 297
5796 / 42 = 138
5796 / 12 = 483
7254 / 39 = 186
7632 / 48 = 159

5 + 5 + 5-5 + 5-5-5-5-5-5-5-55-5-5-5-5-5-6-0

-91