x=根号5+2,求x方-x+根号5的值求教QAQ

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x=根号5+2,求x方-x+根号5的值求教QAQ

x=根号5+2,求x方-x+根号5的值求教QAQ
x=根号5+2,求x方-x+根号5的值
求教QAQ

x=根号5+2,求x方-x+根号5的值求教QAQ
x=根号5+2
x方-x+根号5
=9+4根号5-根号5-2+根号5
=7+4根号5