20042+20032+20022+20012+20002-19992-19982-19972-19962-19952=how many.
20042+20032+20022+20012+20002-19992-19982-19972-19962-19952=多少．
<gadget id="calculator">20_002 - 19_992 - 19_982 - 19_972 - 19_962 - 19_952</gadget>
<output>-79_858</output>

<gadget id="calculator">20_042 + 20_032 + 20_022 + 20_012 + (-79_858)</gadget>
<output>250</output>

<result>250</result>