A=(9/5)+(2/5)×(11/4)
=(9/5)+(11/10)
=(18/10)+(11/10)
=29/10
B=(8/3)-(8/3)×(9/16)
=(8/3)-(72/48)
=(8/3)-(1/2)
=(8/3)-(9/6)
=(16/3)-(9/6)
=7/3
C=(8/3)-(5/7)/(20/21)
=(8/3)-(5/7)×(21/20)
=(8/3)-(105/140)
=(8/3)-(3/4)
=(32/12)-(9/12)
=23/12
D=(1/7)+(6/5)/(12/35)
=(1/7)+(6/5)×(35/12)
=(1/7)+(210/60)
=(1/7)+(7/2)
=(2/14)+(49/14)
=51/14