Mathematics
Junior High
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7.(x²+2x+4)(x²+2x-6)+21可因式分解成下列何者?
(A) (x-3) (x+1)(x-1)2
((x² + 2 x )
(B) (x+3)(x+1)(x-1)²
(C) (x-3) (x-1) (x+1) ² 2x + 5 (D) (x+3) (x-1)(x+1)²
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