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急~送上10點!高一數學指數的運算?
Jan 2nd 2014, 07:23

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因為 a^x = √2 + 1, 所以 a^(-x) = ( √2 + 1)^(-1) = 1 / ( √2 + 1) = ( √2 - 1) / [( √2 + 1) ( √2 - 1)] = ( √2 - 1) / (2 - 1) = √2 - 1...

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