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2x-x2+1等于多少?
人气:420 ℃ 时间:2020-06-21 15:36:20
解答
楼主,
问题:2x-x²+1=?
原式=-(x²-2x-1)
=-[(x²-2x+1)-2]
=-[(x-1)²-2]
=-(x-1+√2)(x-1-√2)
=(x-1+√2)(1+√2-x)
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