(1+1/2+1/3+.+1/2010)×(1/2+1/3+.+1/2011)-(1+1/2+1/3+.+1/2011)×(1/2+1/3+.+1/201
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![(1+1/2+1/3+.+1/2010)×(1/2+1/3+.+1/2011)-(1+1/2+1/3+.+1/2011)×(1/2+1/3+.+1/201](/uploads/image/z/443292-60-2.jpg?t=%281%2B1%2F2%2B1%2F3%2B.%2B1%2F2010%29%C3%97%281%2F2%2B1%2F3%2B.%2B1%2F2011%29-%281%2B1%2F2%2B1%2F3%2B.%2B1%2F2011%29%C3%97%281%2F2%2B1%2F3%2B.%2B1%2F201)
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(1+1/2+1/3+.+1/2010)×(1/2+1/3+.+1/2011)-(1+1/2+1/3+.+1/2011)×(1/2+1/3+.+1/201
(1+1/2+1/3+.+1/2010)×(1/2+1/3+.+1/2011)-(1+1/2+1/3+.+1/2011)×(1/2+1/3+.+1/201
(1+1/2+1/3+.+1/2010)×(1/2+1/3+.+1/2011)-(1+1/2+1/3+.+1/2011)×(1/2+1/3+.+1/201
令1/2+1/3+.+1/2010=a,1/2+1/3+.+1/2011=b,则
原式=(1+a)b-(1+b)a
=b+ab-a-ab
=b-a
=(1/2+1/3+.+1/2010+1/2011)-(1/2+1/3+.+1/2010)
=1/2011