sprawdzenie i poprawienie błedów
\(\displaystyle{ W(x)=x^3-3x^2+5x-1
W(- \sqrt{2})=(- \sqrt{2})^3-3 \cdot (- \sqrt{2})^2+5 \cdot (- \sqrt{2})-1=(- \sqrt{2})+6+5 \cdot (- \sqrt{2})-1=(- \sqrt{2})+5+5 \cdot (- \sqrt{2})=(- \sqrt{2})+10 \cdot (- \sqrt{2})}\)
\(\displaystyle{ (- \sqrt{2})+10 \cdot (- \sqrt{2}) /:(- \sqrt{2})}\)
\(\displaystyle{ \frac{10}{- \sqrt{2}} / \cdot (- \sqrt{2})}\)
\(\displaystyle{ \frac{10 \cdot (- \sqrt{2})}{2}= 5 \cdot (- \sqrt{2})}\)
\(\displaystyle{ W(\frac{1}{ \sqrt{3}})=(\frac{1}{ \sqrt{3}})^3-3 \cdot (\frac{1}{ \sqrt{3}})^2+5 \cdot (\frac{1}{ \sqrt{3}})-1=\frac{1}{ \sqrt{3}}-3 \cdot \frac{1}{3}+5 \cdot (\frac{1}{ \sqrt{3}})-1=\frac{1}{ \sqrt{3}}+3 \cdot (\frac{1}{ \sqrt{3}})}\)
\(\displaystyle{ \frac{1}{ \sqrt{3}}+3 \cdot \frac{1}{ \sqrt{3}} /:(\frac{1}{ \sqrt{3}})}\)
\(\displaystyle{ \frac{3}{{1}{ \sqrt{3}}}/ \cdot (\frac{1}{ \sqrt{3}})}\)
\(\displaystyle{ \frac{1}{ \sqrt{3}}}\)