hmm...
Posted: 05/06-2007 11:06
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+40+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50=?
[tex]1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+40+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50[/tex]
[tex]= \frac{50(1 +50)}{2} = \underline{\underline{1275}}[/tex]
Dette var en aritmetisk rekke. Se her:http://www.matematikk.net/ressurser/per ... php?aid=34