已知a+1/a=4,求a²+1/a²和a 4+1/a 4的值
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已知a+1/a=4,求a²+1/a²和a 4+1/a 4的值
已知a+1/a=4,求a²+1/a²和a 4+1/a 4的值
已知a+1/a=4,求a²+1/a²和a 4+1/a 4的值
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