- 2 целых 2\3 + - 5 целых 1\4 + 3 целых 2\5

-2 2/3-5 1/4+3 2/5=

1)-2 2/3-5 1/4=-2 8/12-5 3/12=-7 11/12

2)-7 11/12+3 2/5=-7 55/60+3 24/60=-4 31/60

(-2,2/3) + (-5,1/4) + 3,2/5=

-2,2/3 + (-5,1/4)= |2,2/3|•4=2,8/12 + |5,1/4|•3=5,3/12=7,11/12

7,11/12 + 3,2/5=7,11/12•5= 7,55/60 + 3,2/5•12= 3,24/60=10,79/60=11,19/60