a) 21234-21 21213 1319913
13------------- =13 ------------ =------------
99900 99900 99900
b)2012-2=2010 cele 2 zecimale de dupa virgula
2010:3 =670 cele 3 zecimale din paranteza
a 2012 a zecimala este 6
c)100-2=98
98:3=32 rest2
S100=2+1+(2+3+4)X32+2+3=3+288+5=296