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а) \(\quad\,\,\,x\)

\(\quad\times [\quad\,\downarrow]\)

\(\quad\underline{2x^2-x-1}\)

\(\,\,\) [ ];

б) \(\quad\,\,\,ab^2\)

\(\quad\times [\quad\,\downarrow]\)

\(\quad\underline{-3a-ab+b}\)

\(\,\,\) [ ];

в) \(\quad\,-4y\)

\(\quad\times [\quad\,\downarrow]\)

\(\quad\underline{y^2-xy+x^2}\)

\(\,\,\) [ ];

г) \(\quad\,-5k^2\)

\(\quad\times [\quad\,\downarrow]\)

\(\quad\underline{4k^5-2k^3+1}\)

\(\,\,\) [ ].