1/2+1/3+1/7+1/11+1/17+1/43+1/59+1/1805-1/1805*1806-1/59*1122=?
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1/2+1/3+1/7+1/11+1/17+1/43+1/59+1/1805-(1/1805)*1806-(1/59)*1122
=1/2+1/3+1/7+1/11+1/17+1/43+[1/1805-(1/1805)*1806]+[1/59-(1/59)*1122]
=1/2+1/3+1/7+1/11+1/17+1/43-1-19
=1/2+1/3-1+(1/11+1/17-1)-18
=-1/6-159/187-18
=-18又(1141/1152)
=1/2+1/3+1/7+1/11+1/17+1/43+[1/1805-(1/1805)*1806]+[1/59-(1/59)*1122]
=1/2+1/3+1/7+1/11+1/17+1/43-1-19
=1/2+1/3-1+(1/11+1/17-1)-18
=-1/6-159/187-18
=-18又(1141/1152)
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