(м-н)³= м³-3м³н+3мн³+н³=м³+н³
(м+н)=м³+3м³н+3мн³+н³
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(м-н)³= м³-3м³н+3мн³+н³=м³+н³
(м+н)=м³+3м³н+3мн³+н³