因式分解:1、x²-6x-27 2、a²+3a-28 3、x²-(2n+1)x+n²+n
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![因式分解:1、x²-6x-27 2、a²+3a-28 3、x²-(2n+1)x+n²+n](/uploads/image/z/1999100-20-0.jpg?t=%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%EF%BC%9A1%E3%80%81x%26%23178%3B-6x-27+2%E3%80%81a%26%23178%3B%2B3a-28+3%E3%80%81x%26%23178%3B-%EF%BC%882n%2B1%EF%BC%89x%2Bn%26%23178%3B%2Bn)
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因式分解:1、x²-6x-27 2、a²+3a-28 3、x²-(2n+1)x+n²+n
因式分解:1、x²-6x-27 2、a²+3a-28 3、x²-(2n+1)x+n²+n
因式分解:1、x²-6x-27 2、a²+3a-28 3、x²-(2n+1)x+n²+n
x²-6x-27 十字相乘:-27=(-9)×3
=(x-9)(x+3)
a²+3a-28 十字相乘:-28=7×(-4)
=(a+7)(a-4)
x²-(2n+1)x+n²+n
=x²-(2n+1)x+n(n+1)
=(x-n)(x-n-1)
1、(x-9)(x+3)
2、(a+7)(a-4)
3、(x-(n+1))(x-n)