A=11/3 - 2/33
=121/33 - 2/33
=119/33
B=8/15 - 1/3 + 4/5
=8/15 - 5/15 + 12/15
=3/15 + 12/15
=1
C=11/4 - 2/5 x 7/4
=55/20 - 8/20 x 35/20
=47/20 -x 35/20
=1645/20
D=2/3 x (1/2 + +9/7) - 5/9 x 2
=2/3 x (7/14 + 18/14) - 5/9 x 2
= 2/3 x 25/14 - 5/9 x 2
=28/42 x 50/28 - 5/9 x 2
=1400/1176 - 5/9 x 2
=25/21 - 5/9 x 2
=125/189 - 105/189 x 2
=20/189 x 2
=40/189
Voila !
