一个整式与x²-y²的和是x²+y²,则这个整式是 A.2x² B.2y² C.-2x² D.-2y²
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![一个整式与x²-y²的和是x²+y²,则这个整式是 A.2x² B.2y² C.-2x² D.-2y²](/uploads/image/z/15182694-54-4.jpg?t=%E4%B8%80%E4%B8%AA%E6%95%B4%E5%BC%8F%E4%B8%8Ex%26%23178%3B-y%26%23178%3B%E7%9A%84%E5%92%8C%E6%98%AFx%26%23178%3B%2By%26%23178%3B%2C%E5%88%99%E8%BF%99%E4%B8%AA%E6%95%B4%E5%BC%8F%E6%98%AF+A.2x%26%23178%3B+B.2y%26%23178%3B+C.-2x%26%23178%3B+D.-2y%26%23178%3B)
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一个整式与x²-y²的和是x²+y²,则这个整式是 A.2x² B.2y² C.-2x² D.-2y²
一个整式与x²-y²的和是x²+y²,则这个整式是 A.2x² B.2y² C.-2x² D.-2y²
一个整式与x²-y²的和是x²+y²,则这个整式是 A.2x² B.2y² C.-2x² D.-2y²
2y²
(x²-y²)+2y²=x²+y²