Question

помогите, с объяснением​

Answer 1

Подробное решение ниже:

$(5\frac{1}{4} -4\frac{11}{40}) :1\frac{9}{20} -(7\frac{1}{5} -6\frac{7}{8}):\frac{3}{4} = (\frac{21*10}{40} -\frac{171}{40}) :1\frac{9}{20} -(\frac{36*8}{40} -\frac{55*5}{40} ):\frac{3}{4} =\frac{210}{40} -\frac{171}{40} ):1\frac{9}{20} -(\frac{288}{40}- \frac{275}{40} ):\frac{3}{4} =\frac{39}{40}:\frac{29}{20}-\frac{13}{40}:\frac{3}{4} =\frac{39}{58}-\frac{13}{30}=\frac{39*15}{870} -\frac{13*29}{870}=\frac{585}{870}-\frac{377}{870}=\frac{208}{870}=\frac{104}{435}$