a) X=1/5 +2,3=1/5+ 23/10 = 2/10 + 23/10 = 25/10 = 2,5
X=2,5
b) Y= (1/4 + 4/9) +1,15
Y=(9/36 +16/36) +1,15
Y= 25/36 + 115/100= 25/36 + 23/20 = 125/180 + 207/180 = 332/180
Y= 83/45=1,8(4)
c) Z= (0,65 + 11/2) +1/25
Z= (0,65 + 5,5) + 4/100
Z= 6,15+ 0,04
Z= 6,19