1 действие ) 10,2 +(-42 1/3)= 10 2/10 +(-42 1/3) = 10 6/30 +(-45 10/30) = -55 16/30 = -55 8/15
2 действие ) -55 8/15 + (-3 13/15) = - 58 21/15 = -59 6/15 = -59 2/5
10,2+(-42 1/3)+(-3 13/15)= -59 2/5
