1.已知a-b=b-c=3/5,a²+b²+c²=1,则ab+bc+ac=__?__2.已知2^48-1能被60~70之间的两个数整除.则这两个数是__?__3.x²+4xy+4y²-9a²+6a-1(因式分解)4.(x+2)(x-2)-4y(x-y) (因式分解)5.56²+4×56×22+44
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![1.已知a-b=b-c=3/5,a²+b²+c²=1,则ab+bc+ac=__?__2.已知2^48-1能被60~70之间的两个数整除.则这两个数是__?__3.x²+4xy+4y²-9a²+6a-1(因式分解)4.(x+2)(x-2)-4y(x-y) (因式分解)5.56²+4×56×22+44](/uploads/image/z/14545677-21-7.jpg?t=1.%E5%B7%B2%E7%9F%A5a-b%3Db-c%3D3%2F5%2Ca%26%23178%3B%2Bb%26%23178%3B%2Bc%26%23178%3B%3D1%2C%E5%88%99ab%2Bbc%2Bac%3D__%3F__2.%E5%B7%B2%E7%9F%A52%5E48-1%E8%83%BD%E8%A2%AB60%7E70%E4%B9%8B%E9%97%B4%E7%9A%84%E4%B8%A4%E4%B8%AA%E6%95%B0%E6%95%B4%E9%99%A4.%E5%88%99%E8%BF%99%E4%B8%A4%E4%B8%AA%E6%95%B0%E6%98%AF__%3F__3.x%26%23178%3B%2B4xy%2B4y%26%23178%3B-9a%26%23178%3B%2B6a-1%28%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%EF%BC%894.%28x%2B2%29%28x-2%29-4y%28x-y%29+%28%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%EF%BC%895.56%26%23178%3B%2B4%C3%9756%C3%9722%2B44%26%23)
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