Question

найдите значение выражения (3/4-4/5)×7,8-(2/3+4/7)×(-7/13) пжл

Answer 1

($frac{3}{4} - frac{4}{5})*7,8-(frac{2}{3}+frac{4}{7})*(frac{-7}{13}) = frac{83}{300}$

1) $frac{3}{4} - frac{4}{5} = frac{15}{20} - frac{16}{20} = frac{-1}{20}$

НОЗ: 20.

2) $frac{2}{3} + frac{4}{7} = frac{14}{21} + frac{12}{21} = frac{26}{21}$

НОЗ: 21.

3) $frac{26}{21} * -frac{7}{13}$ = $-frac{2}{3}$

4) $frac{-1}{20} * 7frac{8}{10} = -frac{1}{20} * frac{78}{10} = -frac{39}{100}$

5) $-frac{39}{100} + frac{2}{3} = -frac{117}{300} + frac{200}{300} = frac{83}{300}$

НОЗ: 300.