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你這道題好像缺條件啊,舉個例子a1=-1,a2=-2,a3=-3……這式子恒不正確啊. 柯西的構造可以給你:配一個(1/根號下a1)^2+(1/根號下a2)^2+(1/根號下a3)^2+……+(1/根號下an)^2就可以了.兩式相乘開平方
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