у(у-5)(у+5)-(у+2)(у²-2у+4)=
=у(у^2-25)-у^3-8=у^3-25у-у^3-8=-25у-8
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у(у-5)(у+5)-(у+2)(у²-2у+4)=
=у(у^2-25)-у^3-8=у^3-25у-у^3-8=-25у-8