102+104+106+...2010=?
问题描述:
102+104+106+...2010=?
答
102+104+106+...+2010
=(102+2008)+(104+2006)+(106+2004)+...+2010
=2110*477+2010
=1006470+2010
=1008480
答
(2010-110)/2=950
102+104+106+...2010=(112+2010)*950/2+(102+108)*2+110
= 1007950+420+110
=1008480
答
=(100+2x1)+(100+2x2)+(100+2x3)+(100+2x4)+.+(100+2x955)
=100x955+2x(1+2+3+4+.+955)
=95500+2x【(1+955)x955÷2】
=95500+955x956
=95500+912980
=1008480