Question

4/25+3/10=
7/9-5/12=
7/20+8/15=
6/7-3/5=
9/16+7/1=
3/4-11/18=
13/28-17/21=
13/35+5/42=
7/24+3/20=

ЕСЛИ МОЖНО С ОБЬЯСНЕНИЯМИ

Answer 1

$frac{4}{25} + frac{3}{10} = frac{4*2+3*5}{50} = frac{23}{50}$
$frac{7}{9} - frac{5}{12} = frac{7*4-5*3}{36} = frac{15}{36} = frac{5}{12}$
$frac{7}{20} + frac{8}{15} = frac{7*3+8*4}{60} = frac{53}{60}$
$frac{6}{7} - frac{3}{5} = frac{6*5-3*7}{35} = frac{9}{35}$
$frac{9}{16} + frac{7}{1} = 7frac{9}{16}$
$frac{3}{4} - frac{11}{18} = frac{9*3-11*2}{36} = frac{5}{36}$
$frac{13}{28}- frac{17}{21}= frac{13*3-17*4}{84} =- frac{29}{84}$
$frac{13}{35} - frac{5}{42} = frac{13*6-5*5}{210} = frac{53}{210}$
$frac{7}{24}+ frac{3}{20}= frac{ 7*5+3*6}{120}= frac{50}{120}= frac{5}{12}$