CatherynPriddy799
CatherynPriddy799
23-07-2015
Mathematics
contestada
(a - b)(a 2 + ab + b 2)
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Аноним
Аноним
23-07-2015
(a−b)(a(2)+ab+b(2))
=(a+−b)(a(2)+ab+b(2))
=(a)(a(2))+(a)(ab)+(a)(b(2))+(−b)(a(2))+(−b)(ab)+(−b)(b(2))
=2a2+a2b+2ab−2ab−ab2−2b2
=a2b−ab2+2a2−2b2
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