#1
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àŢ¡¡ÓÅѧ
ÍÂÒ¡·ÃÒºÇèÒ µÃ§ [2^(x-1)]^2 = 2^2x-2 = 4^x-1 µÒÁÊÁºÑµÔàŢ¡¡ÓÅѧ¢éÍä˹¤ÃѺ
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#2
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$(a^m)^n=a^{mn}=(a^n)^m$ ¤ÃѺ
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