(3а-b)^3=(3a-b)*(9a^2+3ab+b^2)
(2-k)^3=(2-k)*(4+2k+k^2)
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(3а-b)^3=(3a-b)*(9a^2+3ab+b^2)
(2-k)^3=(2-k)*(4+2k+k^2)