若a²-3a+1=0,求代数式a²+1/a².是a的2次方,
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若a²-3a+1=0,求代数式a²+1/a².是a的2次方,
若a²-3a+1=0,求代数式a²+1/a².是a的2次方,
若a²-3a+1=0,求代数式a²+1/a².是a的2次方,
因为a²-3a+1=0 a-3+1/a=0/a a+1/a=3
所以a²+1/a²=a²+1/a²+2-2
=(a+1/a)²-2
=3²-2
=7