Sagot :
3 7 / 10 = 37 / 10 ;
12 = 120 / 10 ;
3 7 / 10 - 12 = 37 / 10 - 120 / 10 = - 83 / 10 ;
12 = 120 / 10 ;
3 7 / 10 - 12 = 37 / 10 - 120 / 10 = - 83 / 10 ;
7 / 10 = 37 / 10
12 = 120 / 10
37 / 10 - 12 = 37 / 10
120 / 10 = -83 / 10
12 = 120 / 10
37 / 10 - 12 = 37 / 10
120 / 10 = -83 / 10