A) (12/5×5/6+3)/1=2+3=5
B) 16/25×20/8-9/5×10/36+1/10=
8/5-2/4+1/10=16/10-5/10+1/10=12/10=6/5
C) 5/8×248=5×31=155
D) 14/100×150=21