快速阿!!!!!!加悬赏!!!
1/2x4+1/4x6+1/6x8+…+1/2010x2012 =? 加过程!!!
急!!!!
看我补充,谢谢
追答原式=1/2(1/2-1/4)+1/2(1/4-1/6)+.......+1/2(1/2010-1/2012)=1/2(1/2-1/4+1/4-1/6+.....+1/2010-1/2012)=1/2(1/2-1/2012)=1005/4012
看我补充,谢谢
追答1/2x4+1/4x6+1/6x8+…+1/2010x2012
=1/2(2/2x4+2/4x6+2/6x8+···+2/2010x2012)
=1/2(1/2-1/4+1/4-1/6+1/6-1/8+···+1/2010-1/2012)
=1/2(1/2-1/2012)
=1/2x2011/2024
=2011/4048