a²-{-4ab+(ab-a²)}-2ab化简
问题描述:
a²-{-4ab+(ab-a²)}-2ab化简
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答
a²-{-4ab+(ab-a²)}-2ab
=a²-﹛-4ab+ab-a²﹜-2ab
=a²+4ab-ab+a²-2ab
=a²+a²+4ab-2ab-ab
=2a²+ab