Номер 3 помогите !!

Question

Номер 3 помогите !!

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Answer 1

(у-3)(у^2+3у+9)-у(у-4)(у+4)=

=у^3-27-у(у^2-16)=

=у^3-27-у^3+16у=

=16у-27=

=16×1,5-27=

=24-27=

=-3