1000+999-998-997+996+…+104+103-102-101=how many
1000+999-998-997+996+…+104+103-102-101=多少
<gadget id="calculator">103 - 102 - 101</gadget>
<output>-100</output>

<gadget id="calculator">104 + (-100)</gadget>
<output>4</output>

<gadget id="calculator">4 * 225</gadget>
<output>900</output>

<result>900</result>