(-3,25+(-1 3/4))+(-1 2/3+(-1 4/9)=
(-3,25+(-1 3/4))+(-1 2/3+(-1 4/9))=-8 1/9 1) -3,25-1 3/4=-3 1/4-1 3/4=-5 2) -1 2/3-1 4/9=-1 6/9-1 4/9=-2 10/9=-3 1/9 3) -5+(-3 1/9)=-5-3 1/9=-8 1/9
-3,25-13/4-12/3-14/9= -3,25-13/4-72/18-48/18= -3,25-13/4-120/18= -3,25-13/4-40/6= -3,25-78/24-160/24= -325/100-238/24= -65/20-119/12= -390/120-1190/120= 1580/120= 158/12= 79/6