初1数学题目

显示全部楼层 · 2008-10-3 20:50:26

计算1/2*4+1/4*6+1/6*8+....+1/2006*2008

千问 · 2008-10-3 20:50:26

=(1/4)*(1/1*2+1/2*3+1/3*4+...+1/1003*1004) =(1/4)*(1-1/2+1/2-1/3+1/3-1/4+...1/1003-1/1004) =(1/4)*(1-1/1004) =(1/4)*(1003/1004) =1003/4016 或=1/2(1/2-1/4+1/4-1/6+1/6-1/8+....+1/2006-1/2008) =1/2(1/2-1/2008) =1003/4016...

千问 · 2008-10-3 20:50:26

=(1/4)*(1/1*2+1/2*3+1/3*4+...+1/1003*1004) =(1/4)*(1-1/2+1/2-1/3+1/3-1/4+...1/1003-1/1004) =(1/4)*(1-1/1004) =(1/4)*(1003/1004) =1003/4016 简单有什么尽管问...

千问 · 2008-10-3 20:50:26

(1/2*4)+(1/4*6)+(1/6*8)+..........+(1/2006*2008) =1/2(1/2-1/4+1/4-1/6+1/6-1/8+....+1/2006-1/2008) =1/2(1/2-1/2008) =1003/4016...

千问 · 2008-10-3 20:50:26

=(1/4)*(1/1*2+1/2*3+1/3*4+...+1/1003*1004)=(1/4)*(1-1/2+1/2-1/3+1/3-1/4+...1/1003-1/1004)=(1/4)*(1-1/1004)=(1/4)*(1003/1004)=1003/4016...

千问 · 2008-10-3 20:50:26

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