1)(1 3/25-4/25):(1-2/5)*(10-9 1/16

(1 3/25-4/25):(1-2/5)*(10-9 1/16)=(28/25-4/25):(5/5-2/5)*(9 16/16-9 1/16)=24/25:3/5*15/16=24/25*3/5*15/16=8/5*15/16=3/2=1 1/2