1/2a²+(1/2ab-1/2a²)+(1/2b²-1/2ba)化简
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1/2a²+(1/2ab-1/2a²)+(1/2b²-1/2ba)化简1/2a²+(1/2ab-1/2a²)+(1/2b²-1/2ba)化简
1/2a²+(1/2ab-1/2a²)+(1/2b²-1/2ba)化简
1/2a²+(1/2ab-1/2a²)+(1/2b²-1/2ba)化简
1/2a²+(1/2ab-1/2a²)+(1/2b²-1/2ba)化简
1/2a²+(1/2ab-1/2a²)+(1/2b²-1/2ba)
=(1/2a²-1/2a²)+(1/2ab-1/2ba)+1/2b²
=1/2b²