(a-999)²-1000(999-a)请写出过程,
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![(a-999)²-1000(999-a)请写出过程,](/uploads/image/z/804500-44-0.jpg?t=%EF%BC%88a-999%EF%BC%89%26%23178%3B-1000%EF%BC%88999-a%EF%BC%89%E8%AF%B7%E5%86%99%E5%87%BA%E8%BF%87%E7%A8%8B%2C)
(a-999)²-1000(999-a)请写出过程,
(a-999)²-1000(999-a)请写出过程,
(a-999)²-1000(999-a)请写出过程,
(a-999)²-1000(999-a)
=(999-a)²-1000(999-a)
=(999-a)(999-a-1000)
=(999-a)(-a-1)
=(a-999)(a+1)
(a-999)²-1000(999-a)
=(a-999)²+1000(a-999)
=(a-999)(a-999+1000)
=(a-999)(a+1)