若a+b=8,ab=2,则a3+b3=

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若a+b=8,ab=2,则a3+b3=若a+b=8,ab=2,则a3+b3=若a+b=8,ab=2,则a3+b3=a³+b³=(a+b)(a²-ab+b²)=(

若a+b=8,ab=2,则a3+b3=
若a+b=8,ab=2,则a3+b3=

若a+b=8,ab=2,则a3+b3=
a³+b³
=(a+b)(a²-ab+b²)
=(a+b)[(a+b)²-3ab]
=8*(64-6)
=8*58
=464

a³+b³
=(a+b)(a²-ab+b²)
=(a+b)[(a+b)²-3ab]
=8*(8²-6)
=8*58
=464

若a+b=8,ab=2
a^3+b^3
=(a+b)(a^2-ab+b^2)
=(a+b)[(a+b)^2-3ab]
=8(64-6)
=8x58
=464

条件不足,无法解答

a^3+b^3=(a+b)(a^2-ab+b^2)=(a+b)[(a+b)^2-3ab]=8×[8^2-3×2]=8×58=464