Odpowiedź:
[tex]3 \frac{3}{4 } + \frac{28}{100} \times \frac{25}{4} = \frac{15}{4 } + \frac{2}{4} = \frac{17}{4} = 4 \frac{1}{4} [/tex]
[tex]4 \frac{8}{100} - 2 \frac{8}{100} \div \frac{13}{25} = \frac{408}{100} - \frac{208}{100} \times \frac{25}{13} = \frac{408}{100} - \frac{16}{4} = \frac{408}{100} - \frac{400}{100} = \frac{8}{100} = \frac{2}{25} [/tex]
[tex]( \frac{21}{4} - \frac{505}{100} ){2} - \frac{1}{25} = ( \frac{525}{100} - \frac{505}{?100} )^{2} - \frac{1}{25} = ( \frac{20}{100} )^{2} - \frac{1}{25} = ( \frac{1}{5} )^{2} - \frac{1}{25} = \frac{1}{25} - \frac{1}{25} = 0[/tex]
