Jawabanmu

2014-03-31T18:30:02+07:00
A) 10^{50} - 25
= 100000000......0000000 - 25
      sebanyak 50 suku
=99999999.......9999975
   sebanyak 47 suku
jumlah digit = 47 . 9 + 7 +5
= 423 + 12
= 435

b)  10^{56} - 76
= 10000000.......00000 - 76
      sebanyak 56 suku
= 9999999999.....9999924
    sebanyak 53 suku
jumlah digit = 53.9 + 2 + 4
= 477 + 6
= 483