1+1/(1+2)+1/(1+2+3)+……+1/(1+2+……+100)=:E:w5n7Z;w2W1]6@,w0|.K5a.Q
算式:提示*O5g*|0x/L*e)V:^(j;z7F5{'d.q6@,w0|.K5a.Q