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(k³+9k²+3)(7k²-5)=
=k³·7k²+k³ ·(-5)+9k² · 7k²+9k² ·(-5)+ 3· 7k²+3·(-5)=
=7k^5-5k³+63k^4-45k²+21k²-15=
=7k^5+63k^4-5k³-24k²-15