Question

(3/4-4/5)*7,8+(2/3+4/7)*7/13

Answer 1

1)$frac{3}{4} - frac{4}{5} = frac{15}{20} - frac{16}{20} =- frac{1}{20}$
2)$-frac{1}{20} * 7frac{8}{10} = -frac{1}{20} * frac{78}{10} = -frac{78}{200} =-0.39$
3)$frac{2}{3} + frac{4}{7} = frac{14}{21} + frac{12}{21} = frac{26}{21} = 1frac{5}{21}$
4)$frac{26}{21} * frac{7}{13} = frac{182}{273}$
5)$frac{78}{200} + frac{182}{273} = frac{21294}{54600} + frac{36400}{54600} = frac{57694}{54600} = 1frac{3094}{54600} =1 frac{1547}{27300} = 1frac{221}{3900}$