计算1000-1-2-3-4-…-20=

计算/{:o,{4P9D2j0S:j+z(L2T6[-s

1000-1-2-3-4-…-20/{:o,{4P9D2j0S:j+z(L2T6[-s

算式：提示8o)j.^3_1b9`3_.D/{:o,{4P9D2j0S:j+z(L2T6[-s

=9U;C:p3t8J:W+v/L(z(F/{:o,{4P9D2j0S:j+z(L2T6[-s