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1.20062005×20062006-20052006×200620052.321789*789788-321788*789789=3.(1+1/2006+1/2007+1/2008)*(1/2006+1/2007+1/2008+1/2009)-(1+1/2006+1/2007+1/2008+1/2009)*(1/2006+1/2007+1/2008)=4.﹙1/11+1/12+1/13+1/14+1/1
题目详情
1.20062005×20062006-20052006×20062005 2.321789*789788-321788*789789=
3.(1+1/2006+1/2007+1/2008)*(1/2006+1/2007+1/2008+1/2009)-(1+1/2006+1/2007+1/2008+1/2009)*(1/2006+1/2007+1/2008)=
4.﹙1/11+1/12+1/13+1/14+1/15)*(1/12+1/13+1/14+1/15+1/16)-(1/11+1/12+1/13+1/14+1/15+1/16)*(1/12+1/13+1/14+1/15)=
3.(1+1/2006+1/2007+1/2008)*(1/2006+1/2007+1/2008+1/2009)-(1+1/2006+1/2007+1/2008+1/2009)*(1/2006+1/2007+1/2008)=
4.﹙1/11+1/12+1/13+1/14+1/15)*(1/12+1/13+1/14+1/15+1/16)-(1/11+1/12+1/13+1/14+1/15+1/16)*(1/12+1/13+1/14+1/15)=
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答案和解析
1.804767509314060
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