Oblicz: 1) 60% * ([latex] 2frac{2}{3} [/latex] - [latex] frac{4}{5} [/latex]) 2) (2,5 : [latex] 1frac{1}{3} )^{2} [/latex] 3)-200 - 40% * (2,75+[latex] frac{1}{3} [/latex])

1. [latex]60\%*(2frac{2}{3}-frac{4}{5})=\\0,6*(2frac{10}{15}-frac{12}{15})=\\0,6*1frac{13}{15}=\\frac{6}{10}*frac{28}{15}=\\frac{42}{25}=\\1frac{17}{25}[/latex] 2. [latex](2,5:1frac{1}{3})^{2}=\\(frac{25}{10}*frac{3}{4})^{2}=\\(frac{75}{40})^{2}=frac{5625}{1600}=3frac{825}{1600}=3frac{33}{64}[/latex] 3. [latex]-200-40\%*(2,75+frac{1}{3})=\\-200-0,4*(2frac{9}{12}+frac{4}{12})=\\-200-0,4*2frac{13}{12}=\\-200-frac{4}{10}*frac{37}{12}=\\-200-frac{37}{30}=\\-200-1frac{7}{30}=\\-201frac{7}{30}[/latex]