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Toán Lớp 9: Cho `a=1/2\sqrt{\sqrt{2}+1/8}-\sqrt{2}/8` a , Chứng minh `4a^2 + \sqrt{2} a – \sqrt{2} = 0` b , Tính `S = a^2 + \sqrt{a^4+a+1}`

Home/ Toán Lớp 9: Cho `a=1/2\sqrt{\sqrt{2}+1/8}-\sqrt{2}/8` a , Chứng minh `4a^2 + \sqrt{2} a – \sqrt{2} = 0` b , Tính `S = a^2 + \sqrt{a^4+a+1}`

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