1+3+5+7+...+107+109-2-4-6-8-...-106-108
4个回答

(1+3+5+7+……+97+109)-(2+4+6+8+……+98+108)

=(1+109)*(55/2)-(2+108)*(55/2)

=110*27.5-110*27.5

=(100-100)*27.5

=0