oblicz: [latex]sqrt{7}[/latex]*3[latex]sqrt{7}[/latex] ([latex]frac{2sqrt5}{5}[/latex])[latex]^{2}[/latex] (-0,1[latex]sqrt{10})^2[/latex]
oblicz: [latex]sqrt{7}[/latex]*3[latex]sqrt{7}[/latex] ([latex]frac{2sqrt5}{5}[/latex])[latex]^{2}[/latex] (-0,1[latex]sqrt{10})^2[/latex]