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](/uploads/image/z/18779552-8-2.jpg?t=1%2F2a%26%23178%3B%2B%EF%BC%881%2F2ab-1%2F2a%26%23178%3B%EF%BC%89%2B%EF%BC%881%2F2b%26%23178%3B-1%2F2ba%EF%BC%89%E5%8C%96%E7%AE%80)
原式=(1/2a²-1/2a²)+(1/2ab-1/2ba)+1/2b²
=1/2b²
=1/2b²
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