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原式=(a^(1/3)-b^(1/3))(a^(2/3)+a^(1/3)b^(1/3)+b^(2/3))/(a^(1/3)-b^(1/3))
-(a^(1/3)+b^(1/3))(a^(2/3)-a^(1/3)b^(1/3)+b^(2/3))/(a^(1/3)+b^(1/3))
=(a^(2/3)+a^(1/3)b^(1/3)+b^(2/3))-(a^(2/3)-a^(1/3)b^(1/3)+b^(2/3))
=a^(1/3)b^(1/3)+a^(1/3)b^(1/3)
=2a^(1/3)b^(1/3)
-(a^(1/3)+b^(1/3))(a^(2/3)-a^(1/3)b^(1/3)+b^(2/3))/(a^(1/3)+b^(1/3))
=(a^(2/3)+a^(1/3)b^(1/3)+b^(2/3))-(a^(2/3)-a^(1/3)b^(1/3)+b^(2/3))
=a^(1/3)b^(1/3)+a^(1/3)b^(1/3)
=2a^(1/3)b^(1/3)
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