X＝2分之根号5减1,求X五次方减5X
人气：332 ℃ 时间：2019-10-19 10:59:07
解答
x=(√5－1)/2,则：x＋x－1=0即：x＋x=1、x=1－x x^5－5x =x(x)－5x =x(1－x)－5x =x－2x＋x－5x =－4x－2(1－x)＋x(1－x) =－x－x－2 =－1－2 =－3
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