1 3supra4 - 5supra4 repede

Răspuns :

1 intreg si 3 / 4 = ( 1 x 4 + 3 ) / 4 = 7 / 4

= 7 / 4 - 5 / 4 = ( 7 - 5 )  / 4 = 2 / 4 = 1 / 2