а) 9 - 9 = 0б) -5 7/12 + 5 7/15 = -5 + 5 + 7/12 + 7/15 = 0 + 47/60 = 47/60в) -2,1 + 2,1 = 0г) 0 - 8 = -8д) 3 4/9 + 7 8/9 = 3 + 7 + 4/9 + 8/9 = 10 + 12/9 = 10 + 4/3 = 10 1/3е) -4,5 + 9 = 4,5 - 4,5 = 0
а) 9 - 9 = 0
б) -5 7/12 + 5 7/15 = -5 + 5 + 7/12 + 7/15 = 0 + 47/60 = 47/60
в) -2,1 + 2,1 = 0
г) 0 - 8 = -8
д) 3 4/9 + 7 8/9 = 3 + 7 + 4/9 + 8/9 = 10 + 12/9 = 10 + 4/3 = 10 1/3
е) -4,5 + 9 = 4,5 - 4,5 = 0