Òòʽ·Ö½â:2aµÄƽ·½b+4ab+2b

=2b(a²+2a+1)=2b(a+1)²


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Òòʽ·Ö½â:a^4 - 3a^2b^2+b^4

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Òòʽ·Ö½â:2a^2b+4ab - 2b

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