A = (29 x 2019 + 71 x 2019) : 100 - 19
A = [2019 x (29 + 71)] : 100 - 19
A = (2019 x 100) : 100 - 19
A = 2019 - 19
A = 2000
B = (3/4 + 5/6) : 1\(\frac{7}{12}\)- 1/2
B = (9/12 + 10/12) : 19/12 - 1/2
B = 19/12 : 19/12 - 1/2
B = 1 - 1/2
B = 1/2
A = (29 x 2019 + 71 x 2019) : 100 - 19
A = [2019 x (29 + 71)] : 100 - 19
A = (2019 x 100) : 100 - 19
A = 2019 - 19
A = 2000