1000+999-998-997+996+995-994-993+...+108+107-106-105+104+103-102-101=how much.
1000+999-998-997+996+995-994-993+…+108+107-106-105+104+103-102-101=多少．
<gadget id="calculator">1 - 101</gadget>
<output>-100</output>

<gadget id="calculator">1_000 + (-100)</gadget>
<output>900</output>

<result>900</result>