(a−2)·(a²+2a+2²) =
= a³+2a²+2²a−2a²−2²a−2³ =
= a³−2³
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(a−2)·(a²+2a+2²) =
= a³+2a²+2²a−2a²−2²a−2³ =
= a³−2³