ejercicio 1









(1/2) 1=numerador 2=denominador
(4/5)+(2/5)=((4+2)/5)=(6/5)
(3/4)+(2/2)=((3+2)/4)=(7/4)
(2/6)+(3/2)=((2+9)/6)=(11/6)
(7/9)-(2/9)=(5/9)
(6/4)-(1/2)=((6-2)/4)=(4/4)=1
(3/2)x(7/4)=(21/8)
(4/2)x(8/4)=(32/8)
(4/5)/(3/9)=(4x9)/(5/3)=(36/15)
(7/9)/(4/8)=(56/36)

ejercicio 2
(1/2)x(3/4)=(3/8)
(8/9)/(1/2)=(16/9)
(7/4)/(6/5)=(24/35)
(5/2)+(7/4)=((10+7)/7)=(17/4)
(8/6)-(3/2)=((8-9)/6)=(-1/6)
(1/2)+4=4(1/2)
(12/2)-(1/4)=((24+1)/4)=((24+1(/4)=(25/4)
(27/2)x(1/4)=(27/8)
(3/2)+(5/2)=(8/2)
(1/2)+(1/2)=1

ejercicio 3
325/100=3.25
1/3=0.3
5/8=0.68