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fenshi
fenshi
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fenshi
1/[x(x+1)]+1/[(x+1)(x+1)]-1/[(x+2)(x+1)]-1/[(x+3)(x+1)]=1/(x+1)[1/x+1/(x+1)-1/(x+2)-1/(x+3)]=4/[x(x+1)(x+3)]