(5/9)*1.8=(5/9)*(9/5)=1
(5/12)/(5/6)=(5/12)*(6/5)=1/2
2.25+3/2*1/2=(9/4)+(3/4)=12/4=3
8/5*5=8
(1/4)/0.025=(1/4)/(5/200)=(1/4)*40=10
(3/2)+(13/5)=(15/10)+(26/10)=41/10=4.1
(7/4)*(5/4)/(7/4)=5/4=1.25