求人接几道数学题,因式分解4、(x²-y²)-(x+y)²-4(x-y)²5、已知x=二十二分之七十五,y=二十五分之四十四,求(x+y)²-(x-y)²的值6、已知a=747k+997,b=747k+998,c=747k+999,求多项式a²+
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![求人接几道数学题,因式分解4、(x²-y²)-(x+y)²-4(x-y)²5、已知x=二十二分之七十五,y=二十五分之四十四,求(x+y)²-(x-y)²的值6、已知a=747k+997,b=747k+998,c=747k+999,求多项式a²+](/uploads/image/z/10913796-36-6.jpg?t=%E6%B1%82%E4%BA%BA%E6%8E%A5%E5%87%A0%E9%81%93%E6%95%B0%E5%AD%A6%E9%A2%98%2C%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A34%E3%80%81%EF%BC%88x%26%23178%3B-y%26%23178%3B%29-%28x%2By%29%26%23178%3B-4%28x-y%29%26%23178%3B5%E3%80%81%E5%B7%B2%E7%9F%A5x%3D%E4%BA%8C%E5%8D%81%E4%BA%8C%E5%88%86%E4%B9%8B%E4%B8%83%E5%8D%81%E4%BA%94%2Cy%3D%E4%BA%8C%E5%8D%81%E4%BA%94%E5%88%86%E4%B9%8B%E5%9B%9B%E5%8D%81%E5%9B%9B%2C%E6%B1%82%EF%BC%88x%2By%EF%BC%89%26%23178%3B-%EF%BC%88x-y%29%26%23178%3B%E7%9A%84%E5%80%BC6%E3%80%81%E5%B7%B2%E7%9F%A5a%3D747k%2B997%2Cb%3D747k%2B998%2Cc%3D747k%2B999%2C%E6%B1%82%E5%A4%9A%E9%A1%B9%E5%BC%8Fa%26%23178%3B%2B)
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