-1*6-1*12-1*20-1*30-...-1*110等于几?
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-1*6-1*12-1*20-1*30-...-1*110等于几?
-1*6-1*12-1*20-1*30-...-1*110等于几?
-1*6-1*12-1*20-1*30-...-1*110等于几?
-1/6-1/12-1/20-1/30-...-1/110
=-(1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+……+1/10-1/11)
=-(1/2-1/11)
=-5/11