(5.67 - 4.94) + (4.94 - 5.67) = 0.73 + (-0.73) = 0
(5.8 + 3.75) - (5.8 - 4.25) = 9.55 - 1.55 = 8
-7.9 - (-5.21 - 11.9) = -7.9 + 5.21 + 11.9 = 9.21
(4.72 - 6.43) - (5.57 + 4.22) = -1.71 - 9.79 = -11.5
(8 11/18 - 4.2) - (3 5/18 + 2.8) = (8 + 11/18 - 4) - (3 + 5/18 + 2) = 4 11/18 - 6 5/18 = -1 6/18 = -1 1/3
-4 1/3 + (5 1/2 - 6 2/7) = -4 1/3 + (5 + 1/2 - 6 - 2/7) = -4 1/3 + (5 1/2 - 6 2/7) = -4 1/3 + (5 + 1/2 - 6 - 2/7) = -4 1/3 + (5 1/2 - 6 2/7) = -4 1/3 + (5 - 6 + 1/2 - 2/7) = -4 1/3 + (-1 + 1/2 - 2/7) = -4 1/3 - (7/2 - 14/7) = -4 1/3 - (77 - 142)/(2*7) = -4 1/3 - (49 - 28)/14 = -4 1/3 - 21/14 = -4 1/3 - 1 7/14 = -5 7/14 = -5 1/2
(5.67 - 4.94) + (4.94 - 5.67)
= 0.73 + (-0.73)
= 0
(5.8 + 3.75) - (5.8 - 4.25)
= 9.55 - 1.55
= 8
-7.9 - (-5.21 - 11.9)
= -7.9 + 5.21 + 11.9
= 9.21
(4.72 - 6.43) - (5.57 + 4.22)
= -1.71 - 9.79
= -11.5
(8 11/18 - 4.2) - (3 5/18 + 2.8)
= (8 + 11/18 - 4) - (3 + 5/18 + 2)
= 4 11/18 - 6 5/18
= -1 6/18
= -1 1/3
-4 1/3 + (5 1/2 - 6 2/7)
= -4 1/3 + (5 + 1/2 - 6 - 2/7)
= -4 1/3 + (5 1/2 - 6 2/7)
= -4 1/3 + (5 + 1/2 - 6 - 2/7)
= -4 1/3 + (5 1/2 - 6 2/7)
= -4 1/3 + (5 - 6 + 1/2 - 2/7)
= -4 1/3 + (-1 + 1/2 - 2/7)
= -4 1/3 - (7/2 - 14/7)
= -4 1/3 - (77 - 142)/(2*7)
= -4 1/3 - (49 - 28)/14
= -4 1/3 - 21/14
= -4 1/3 - 1 7/14
= -5 7/14
= -5 1/2