若a+1/a=3,则a²+1/a²等于那么以此类推:若a-1/a=3,则a²+1/a²等于
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若a+1/a=3,则a²+1/a²等于那么以此类推:若a-1/a=3,则a²+1/a²等于
若a+1/a=3,则a²+1/a²等于
那么以此类推:若a-1/a=3,则a²+1/a²等于
若a+1/a=3,则a²+1/a²等于那么以此类推:若a-1/a=3,则a²+1/a²等于
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数学之美团为你解答
a +1/a = 3
(a+ 1/a)² = 9
a² + 2*a*1/a +(1/a)² = 9
a² + 2 + 1/a² = 9
a² + 1/a² = 7
a - 1/a = 3
(a - 1/a)² = 9
a² - 2 + 1/a² = 9
a² + 1/a² = 11
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等于5,a=1/2,-1/2