Question

Помогите пожалуйста 751 номер

Answer 1

1.
$frac{52}{63} - frac{x}{63} = frac{25}{63} \ \ 52-x =25 \ \ x=52-25 \ \ x= 27 \ \ frac{52}{63} - frac{27}{63} = frac{25}{63} \ \ frac{25}{63} = frac{25}{63}$
2.
$frac{x}{38} + frac{14}{38} = frac{23}{38} \ \ x+14=23 \ \ x=23-14 \ \ x=9 \ \ frac{9}{38} + frac{14}{38} = frac{23}{38} \ \ frac{23}{38} = frac{23}{38}$
3.
$( frac{12}{13} +x)- frac{5}{13} = frac{9}{13} \ \ ( frac{12}{13} +x)= frac{9}{13}+frac{5}{13} \ \ x= frac{14}{13} - frac{12}{13} \ \ x= frac{2}{13} \ \ ( frac{12}{13} + frac{2}{13} )- frac{5}{13} = frac{9}{13} \ \ frac{14-5}{13} = frac{9}{13} \ \ frac{9}{13} = frac{9}{13}$
4.
$(x- frac{21}{31} ) + frac{14}{31} = frac{25}{31} \ \ x- frac{21}{31}= frac{25-14}{31} \ \ x= frac{11+21}{31} \ \ x= frac{32}{31} = 1 frac{1}{31} \ \ (1 frac{1}{31} - frac{21}{31} ) + frac{14}{31} = frac{25}{31} \ \ frac{32-21+14}{31} =frac{25}{31} \ \ frac{25}{31} = frac{25}{31}$