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(4X+1)(4X-1)-(2X-5)(2X+3)计算
人气:495 ℃ 时间:2020-04-06 00:20:08
解答
=16x²-1-(4x²-4x-15)
=16x²-1-4x²+4x+15
=12x²-4x+14
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