请帮我做2道题1·(2009-1)+(2006-2)+(2005-3)+…+(1005-1003)=2·111…1(2001个1)后跟222…2(2001个2)/333…3(2001个3)
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![请帮我做2道题1·(2009-1)+(2006-2)+(2005-3)+…+(1005-1003)=2·111…1(2001个1)后跟222…2(2001个2)/333…3(2001个3)](/uploads/image/z/6871640-32-0.jpg?t=%E8%AF%B7%E5%B8%AE%E6%88%91%E5%81%9A2%E9%81%93%E9%A2%981%C2%B7%282009-1%29%2B%282006-2%29%2B%282005-3%29%2B%E2%80%A6%2B%281005-1003%29%3D2%C2%B7111%E2%80%A61%EF%BC%882001%E4%B8%AA1%EF%BC%89%E5%90%8E%E8%B7%9F222%E2%80%A62%EF%BC%882001%E4%B8%AA2%EF%BC%89%2F333%E2%80%A63%EF%BC%882001%E4%B8%AA3%EF%BC%89)
请帮我做2道题1·(2009-1)+(2006-2)+(2005-3)+…+(1005-1003)=2·111…1(2001个1)后跟222…2(2001个2)/333…3(2001个3)
请帮我做2道题
1·(2009-1)+(2006-2)+(2005-3)+…+(1005-1003)=
2·111…1(2001个1)后跟222…2(2001个2)/333…3(2001个3)
请帮我做2道题1·(2009-1)+(2006-2)+(2005-3)+…+(1005-1003)=2·111…1(2001个1)后跟222…2(2001个2)/333…3(2001个3)
一、1007014
二、333…34(2000个3)
1·(2009-1)+(2008-2)+(2007-3)+…+(1004-1004)
=2008+2006+2004+.....2
=(2008+0)*[(2008-0)/2]/2
=2010*507 =1019070 (原题有误吧?如果不是这样,我也不会做)
2·111…1(2001个1)后跟222…2(2001个2)/333…3(2001个3...
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1·(2009-1)+(2008-2)+(2007-3)+…+(1004-1004)
=2008+2006+2004+.....2
=(2008+0)*[(2008-0)/2]/2
=2010*507 =1019070 (原题有误吧?如果不是这样,我也不会做)
2·111…1(2001个1)后跟222…2(2001个2)/333…3(2001个3)
=111…1(2001个1)*11111.....(2001个1)*2/[111…1(2001个1)*3]
=11111.....(2001个1)*2/3
=37037037.....37(667个3,667个7,666个0)*2
=740740.。。74(667个7,667个4,666个0)
收起
1。2008+1002X(2006-1003)=1007014
2。111...1(2001个1)后跟222...2(2001个2)/333...3(2001个3)
=111.1(2001个1)后跟2001个0/333...3(2001个3)+222...2(2001个2)/333...3(2001个3)
=1000...0(2001个0)/3+2/3
=1000...2(2000个0)/3