解方程:5X/(1*2) 5X/(2*3) 5X/(3*4) 5X/(4*5) ... 5X/(2003*2004) 5X/(2004*2005)=1
解方程:5X/(1*2)+ 5X/(2*3)+ 5X/(3*4) +5X/(4*5) +... +5X/(2003*2004)+ 5X/(2004*2005)=1 .
解:5X(1/1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+……+1/2003-1/2004+1/2004-1/2005)
=1,
5X(1-1/2005)=1,
5X(2004/2005)=1.所以,X=401/2004.
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