(1/2+1/3+.1/2007)(1+1/2+1/3+.1/2006)-(1+1/2+1/3+.1/1/2007)(1/2+1/3+.1/2006)
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2007*(1-1/2)*(1-1/3)*(1-1/4).(1-1/2007)=?
(1/2+1/3+.1/2007)(1+1/2+1/3+.1/2006)-(1+1/2+1/3+.1/1/2007)(1/2+1/3+.1/2006)
(1/2008-1)*(1/2007-1)*(1/2006-1)*...*(1/3-1)*(1/2-1)
|2009/1-2008/1|+|2008/1-2007/1|+|2007/1-2006/1|+.+|3/1-2/1|+|2/1-1|
(1/2+1/3+...+1/2007)*(1+1/2+1/3+...+1/2006)-(1+1/2+1/3+...+/2007)*(1/2+1/3+...+1/2006)
(-1*1/2)+(-1/2*1/3)+(-1/3*1/4)+...+(-1/2007*1/2008)
|1/3-1/2|+|1/4-1/3|+|1/5-1/4|+.+|1/2008-1/2007|
1/1*2+1/2*3+.+1/2006*2007+1/2007*2008
2*1 1/2*1 1/3*1 1/4*1 1/5*.1 1/2006*1 1/2007
(1-1/2^)(1-1/3^)……(1-1/2007^)(1-1/2008^)
(1-1/2)乘(1-1/3).乘(1-1/2006)乘(1-1/2007)急用,
(1+1/2+ +1/2007)x(1/2+1/3+ +1/2008)-(1+1/2+ +1/2008)x(1/2+1/3+ +1/2007)=?
1*2/1+2*3/1+3*4/1+...+2005*2006/1+2006+2007/1+2007*2008/1
1-(1/2-1/3)-(1/3-1/4).-(1/2007-1/2008)=?
2007x(1-1/2)x(1-1/3)X(1-1/4).(1-1/2007)
(1-1∕2;)*(1+1∕2)*(1-1∕3)*(1+1∕3)*.*(1-1∕2007)*(1+1∕2007)
1/1×2/1+2/1×3/1+3/1+4/1+4/1+5/1.+2007/1+2008/1
1/1*2+1/2*3+1/3*4+1/4*5+.+1/2006*2007