If non-zero rational numbers a, b, c satisfy: a+b+c=0. , then ((|a|)/(a))+((|b|)/(b))+((|c|)/(c))+((|abc|)/(abc))= How many.
若非零有理数a，b，c满足：a+b+c=0．，则((|a|)/(a))+((|b|)/(b))+((|c|)/(c))+((|abc|)/(abc))=多少．
<gadget id="calculator">1 - 1 - 1</gadget>
<output>-1</output>

<gadget id="calculator">1 + (-1)</gadget>
<output>0</output>

<result>0</result>