Question

简便计算:(1+5+7+…+99+101)-(2+4+6+…+98+100)

Answer 1

(1+3+5+7+…+99+101)-(2+4+6+…+98+100)

=1+3-2+5-4+7-6+.+101-100

=1+1+1+...+1

=51