求值的公式形如 a2-b2=(a+b))(a-b)这些.急用.
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![求值的公式形如 a2-b2=(a+b))(a-b)这些.急用.](/uploads/image/z/6972818-50-8.jpg?t=%E6%B1%82%E5%80%BC%E7%9A%84%E5%85%AC%E5%BC%8F%E5%BD%A2%E5%A6%82+a2-b2%3D%28a%2Bb%29%29%28a-b%29%E8%BF%99%E4%BA%9B.%E6%80%A5%E7%94%A8.)
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