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23)

A = - 2/21 x 14/5 - 8/5

A = - 28/105 - 8/5

A = (7 x - 4) / (7 x 15) - (8 x 3) / (5 x 3)

A = - 4/15 - 24/15

A = - 39/15

B = 1/4 + 5/3 x - 1/8

B = 1/4 - 5/24

B = (1 x 6) / (4 x 6) - 5/24

B = 6/24 - 5/24

B = 1/24

C = 4/- 3 + - 7/6  x - 2/5

C= - 4/3 + 14/30

C = (- 4 x 10) / (3 x 10) + 14/30

C = - 40/30 + 14/30

C = - 26/30

C = (2 x - 13) / (2 x 15)

C = - 13/15

D= (8/15 - 7/5) x (- 1/6 + 2/9)

D = [8/15 - (7 x 3) / (5 x 3)] x [(- 1 x 3) / (6 x 3) + (2 x 2) / (9 x 2)]

D = (8/15 - 21/15) x (- 3/18 + 4/18)

D = - 13/15 x 1/18

D = - 13/270.

24)

a. 8/9 - 2/3 = 2/9

b. 7/2 x - 5/4 = - 35/8

c. - 5/6 x 9/4 = - 15/8

d. 2/5 - 4/15 = 2/15