求(a²-1)x²-(2a²+a+1)x+a(a+1)因式分解求救
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求(a²-1)x²-(2a²+a+1)x+a(a+1)因式分解求救
求(a²-1)x²-(2a²+a+1)x+a(a+1)因式分解
求救
求(a²-1)x²-(2a²+a+1)x+a(a+1)因式分解求救
(a+1)(a-1)x²-(2a²+a+1)x+a(a+1)
=[(a+1)x-a][(a-1)x-(a+1)]
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