2X/1x3+2X/3x5+2X/5x7+…+2X/2003x2005=2004
问题描述:
2X/1x3+2X/3x5+2X/5x7+…+2X/2003x2005=2004
答
2X/1x3+2X/3x5+2X/5x7+…+2X/2003x2005=2004
(1-1/3+1/3-1/5+……+1/2003-1/2005)x=2004
(1-1/2005)x=2004
2004x/2005=2004
x=2005