Найдите значение выражения, предварительно сократив дроби:
1) $\frac{25}{80} + \frac{45}{60}$;
2) $\frac{20}{45} + \frac{26}{54}$;
3) $\frac{36}{300} + \frac{12}{40} - \frac{350}{1000}$;
4) $\frac{14}{24} - \frac{39}{90} + \frac{15}{100}$;
5) $\frac{42}{120} + \frac{20}{32} - \frac{28}{160}$;
6) $\frac{45}{72} - \frac{33}{144} - \frac{20}{64}$.
$\frac{25}{80} + \frac{45}{60} = \frac{5}{16} + \frac{3}{4} = \frac{5 + 12}{16} = \frac{17}{16} = 1\frac{1}{16}$
$\frac{20}{45} + \frac{26}{54} = \frac{4}{9} + \frac{13}{27} = \frac{12 + 13}{27} = \frac{25}{27}$
$\frac{36}{300} + \frac{12}{40} - \frac{350}{1000} = \frac{3}{25} + \frac{3}{10} - \frac{7}{20} = \frac{12 + 30 - 35}{100} = \frac{7}{100}$
$\frac{14}{24} - \frac{39}{90} + \frac{15}{100} = \frac{7}{12} - \frac{13}{30} + \frac{3}{20} = \frac{35 - 26 + 9}{60} = \frac{18}{60} = \frac{3}{20}$
$\frac{42}{120} + \frac{20}{32} - \frac{28}{160} = \frac{7}{20} + \frac{5}{8} - \frac{7}{40} = \frac{14 + 25 - 7}{40} = \frac{32}{40} = \frac{4}{5}$
$\frac{45}{72} - \frac{33}{144} - \frac{20}{64} = \frac{5}{8} - \frac{11}{48} - \frac{5}{16} = \frac{30 - 11 - 15}{48} = \frac{4}{48} = \frac{1}{12}$
Пожауйста, оцените решение