若a²-3a+1=0,则a²+1/a²的值是多少
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若a²-3a+1=0,则a²+1/a²的值是多少
若a²-3a+1=0,则a²+1/a²的值是多少
若a²-3a+1=0,则a²+1/a²的值是多少
a²-3a+1=0
a²+1=3a
两边除以a
a+1/a=3
两边平方
a²+2+1/a²=9
a²+1/a²=7
a2+1=3a,a2=3a-1,a2+1/a2=3a/3a-1