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a. - 7/50 + 2/75

= (- 7 x 3) / (50 x 3) + (2 x 2) / (75 x 2)

= - 21/150 + 4/150

= - 17/150

b. 1/5 + - 2/3

= (1 x 3) / (5 x 3) - (2 x 5) / (3 x 5)

= 3/15 - 10/15

= - 7/15

c. 1/12 - 1/9

= (1 x 3) / (12 x 3) - (1 x 4) / (9 x 4)

= 3/36 - 4/36

= - 1/36

d. 4/18 + 5/27

= (4 x 3) / (18 x 3) + (5 x 2) / (27 x 2)

= 12/54 + 10/54

= 22/54

= (2 x 11) / (2 x 27)

= 11/27

e. 17/- 24 + (- 5/36)

= (- 17 x 3) / (24 x 3) - (5 x 2) / (36 x 2)

= - 51/72 - 10/72

= - 51/72

f. 3/16 - - 1/12

= (3 x 3) / (16 x 3) + (1 x 4) / (12 x 4)

= 9/48 + 4/48

= 13/48

g. 8/- 17 - (- 1/15)

= (- 8 x 15) /(17 x 15) + (1 x 17) / (15 x 17)

= - 120/255 + 17/255

= - 103/255

h. 2/5 + - 2/15 - 7/12

= (2 x 12) / (5 x 12) - (2 x 4) / (15 x 4) - (7 x 5) / (12 x 5)

= 24/60 - 8/60 - 35/60

= - 19/60