Question

Обчислити
а) 2 3/5 + 1 3/5 ; б) 7 – 3 2/7 ;
в) 2 5/9 – 1 7/9 ; г) ( 3 2/4 + 1 2/4 ) – (3 2/7 – 1 5/7 ).

Answer 1

Ответ:

$2\frac{3}{5}+1\frac{3}{5}=3\frac{6}{5}=4\frac{1}{5}\\ 7-3\frac{2}{7}=6\frac{7}{7}-3\frac{2}{7}=3\frac{5}{7}\\ 2\frac{5}{9}-1\frac{7}{9}=\frac{23}{9}-\frac{16}{9}=\frac{7}{9}\\ (3\frac{2}{4}+1\frac{2}{4})-(3\frac{2}{7}-1\frac{5}{7} )=5-(\frac{23}{7}-\frac{12}{7}=5-\frac{11}{7}=\frac{35-11}{7}=\frac{24}{7}=3\frac{3}{7}$