因式分解:①x²+y²;②x²-y²;③-x²+y²;④-x
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因式分解:①x²+y²;②x²-y²;③-x²+y²;④-x²-y²
![因式分解:①x²+y²;②x²-y²;③-x²+y²;④-x](/uploads/image/z/2954041-25-1.jpg?t=%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%EF%BC%9A%E2%91%A0x%26%23178%3B%2By%26%23178%3B%EF%BC%9B%E2%91%A1x%26%23178%3B-y%26%23178%3B%EF%BC%9B%E2%91%A2-x%26%23178%3B%2By%26%23178%3B%EF%BC%9B%E2%91%A3-x)
①x²+y²
②x²-y²=(x+y)(x-y)
③-x²+y²=y²-x²=(y+x)(y-x)
④-x²-y²=-(x²+y²)
②x²-y²=(x+y)(x-y)
③-x²+y²=y²-x²=(y+x)(y-x)
④-x²-y²=-(x²+y²)