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A = 3 - 11/9
= 3/1 - 11/9
= 3x9/1x9 - 11/9
= 27/9 - 11/9
= 16/9

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

C= 7/4 + 7/5
= 7x5 / 4x5 + 7x4 / 5x4
= 35/20 + 28/20
= 63/20

D= 48/18 x 36/12
= 1728/216
= 8