Rozwiązanie
[tex](3k-2)(k-4)=3k^2-12k-2k+8=\boxed{3k^2-14k+8}\\\\(2m-1)(m+1)=2m^2+2m-m-1=\boxed{2m^2+m-1}\\\\(6c+1)(c-1)=6c^2-6c+c-1=\boxed{6c^2-5c-1}\\\\(2x-1)(x-2)=2x^2-4x-x+2=\boxed{2x^2-5x+2}[/tex]
