”已知a²+5a-1=0,求a²+1/a²和a+1/a的值”
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”已知a²+5a-1=0,求a²+1/a²和a+1/a的值”
”已知a²+5a-1=0,求a²+1/a²和a+1/a的值”
”已知a²+5a-1=0,求a²+1/a²和a+1/a的值”