4x²*²－13x²＋9（因式分解）
4乘以x的四次方－13乘以x²＋9,
人气：221 ℃ 时间：2019-08-19 12:11:27
解答
原式=(4x²-9)(x²-1)
=(2x+3)(2x-3)(x+1)(x-1)
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