ab互为相反数,xy互为倒数,|c|=3.求1/3c³(xy)³-2/3c²(a+b)²-4/3c³(xy)³

问题描述:

ab互为相反数,xy互为倒数,|c|=3.求1/3c³(xy)³-2/3c²(a+b)²-4/3c³(xy)³

原式=c³/3-(2/3)×9×0-(4/3)×c³×1
=c³/3-(4/3)c³
=-c³
=±27;
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