How much is 1000 out of a minus 999 out of a minus 998 out of a until one out of a?

=1000/a-（1+999）/a-（2+998）/a-.-（499+501）/a-500/a
=1000/a-500/a-1000/ax499
=500/a-499000/a
=-498500/a
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