若a²-3a+1=0,求a²+1/a²的值
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若a²-3a+1=0,求a²+1/a²的值
若a²-3a+1=0,求a²+1/a²的值
若a²-3a+1=0,求a²+1/a²的值
a²-3a+1=0
显然a≠0,除以a得
a-3+1/a=0
a+1/a=3
(a+1/a)²=3²
a²+1/a²+2=9
a²+1/a²=7