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x方-x-1 因式分解
人气:375 ℃ 时间:2020-06-02 07:01:31
解答
x²-x-1
=(x²-x+1/4)-5/4
=(x-1/2)²-5/4
=(x-1/2+√5/2)(x-1/2-√5/2)
=[x+(√5-1)/2][x-(√5+1)/2]
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