幻想Sherlock‧Holmes

DO you belive that falling in love at first sight? I didn't before,but I do now. When I saw her at first sight,I took her as my dreamboat. She stood in front of me like an angle. And I can't belive my eyes. She almost didn't look at me,but I didn't care. She was so gorgeous,and I stare at her all the time. However,I can't still wake up my nerve to tell her "I'm into you!".

若x²-13x+1=0,則x2+1/x²=       {推甄}

(A)167

(B)169

(C)171

(D)173

若t=x+1/x,則x⁴x³-4x2+x+1=0變成:  {推甄}

(A)x²(t²+t-2)=0

(B)x²(t²+t-3)=0

(C)x²(t²+t-4)=0

(D)x²(t²+t-6)=0