a) 12.8 0.25:(0.125 - 3/4) = 12.8 0.25 / (0.125 - 0.75)= 3.2 / (-0.625)= -5.12
b) (1.5 + 2 2/3 + 3 3/4) 3.6 / (15 1/8 : 2 - 14)= (1.5 + 2.6667 + 3.75) 3.6 / (15.125 / 2 - 14)= 7.9167 * 3.6 / (7.5625 - 14)= 28.5 / (-6.4375)≈ -4.43
a) 12.8 0.25:(0.125 - 3/4) = 12.8 0.25 / (0.125 - 0.75)
= 3.2 / (-0.625)
= -5.12
b) (1.5 + 2 2/3 + 3 3/4) 3.6 / (15 1/8 : 2 - 14)
= (1.5 + 2.6667 + 3.75) 3.6 / (15.125 / 2 - 14)
= 7.9167 * 3.6 / (7.5625 - 14)
= 28.5 / (-6.4375)
≈ -4.43