(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,
(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)