1/2003+2/2003.4005/2003=

问题描述:

1/2003+2/2003.4005/2003=

原式=(1+2+3+...+4005)/2003
=[(1+4005)+(2+4004)+...+(2002+2004)+2003]/2003
=[(4006*2002)+2003]/2003
=4006*2002/2003 +2003/2003
=2*2002+1
=4005