(3+根5)(3-根5)-(根2-1)二次方
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![(3+根5)(3-根5)-(根2-1)二次方](/uploads/image/z/14688392-32-2.jpg?t=%283%2B%E6%A0%B95%29%283-%E6%A0%B95%29-%28%E6%A0%B92-1%29%E4%BA%8C%E6%AC%A1%E6%96%B9)
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(3+根5)(3-根5)-(根2-1)二次方
(3+根5)(3-根5)-(根2-1)二次方
(3+根5)(3-根5)-(根2-1)二次方
=3平方-根5平方-根2平方+2根2-1 =1+2根2
希望采纳
=3^2-(根号5)^2-[(根号2)^2-2根号2+1] =9-5-(2-2根号2+1) =4-(3-2根号2) =1+2根号2