№ 1
- 2 1/4 + (+ 7 1/3) + (- 12) + (+ 2 1/4) = - 2 1/4 + 7 1/3 - 12 + 2 1/4 = 2 1/4 - 2 1/4 + 7 1/3 - 12 = 0 + 7 1/3 - 12 = 22/3 - 12/1 = 22/3 - 36/3 = - 14/3 = - 4 2/3
№ 2
10,25 + (- 1,03) - (- 8,5) + 1,47 - (+ 5,1) = 10,25 - 1,03 + 8,5 + 1,47 - 5,1 = 14,09
№ 3
- 3/4 + (- 1/3) - (+ 3/4) + (- 1 2/3) = - 3/4 - 1/3 - 3/4 - 1 2/3 = - 3/4 - 3/4 - 1/3 - 1 2/3 = - 6/4 - 1 3/3 = - 6/4 - 2 = - 3/2 - 2 = - 3/3 - 4/2 = - 7/2 = - 3 1/2