zadanie z trescia magdzia: Do PONUMEROWANIA stron książki potrzeba 1994 cyfr. Ile stron ma ta książka, jeśli numerowanie zaczęto od piątej strony, którą oznaczono numerem5.

%252525253Cpre%252525253E%252525253Cb%252525253EL%25252525C3%25252525B3%25252525C5%2525252584%25252525C4%2525252587%252525253A%252525253C%252525252Fb%252525253E%2525252520100-5%252525253D95%252525250A5-9%2525252520%252525253D%25252525201%2525252520cyfra%252525250A10-99-%25252525202%2525252520cyfry%252525250A100-999%2525252520-%25252525203%2525252520cyfry%252525250A%252525250Astron%252525253D5%252525252B90%252525252Bx%252525252B5%252525250A%252525250A5*1%252525252B2*90%252525252B3*x%252525253D1994%252525250A5%252525252B180%252525252B3x%252525253D1994%252525250A3x%252525253D1994-185%252525250A3x%252525253D1809%252525250Ax%252525253D603%252525250A%252525250Astron%252525253D95%252525252B603%252525252B5%252525253D703%252525250A%252525253C%252525252Fpre%252525253E

Lóńć: 5+90*2+3x=1994 stron=90+5+5+x 3x=1994-5-180=1809 x=603 stron=5+90+5+603=703 (w tym 698 ponumerowanych).

magdzia: dzieki