a) 0,75x0,(6) =75/100 x 6/9=3/4 x 6/9=1/2=0,5
b) 2,(2)x1,44 =(22-2)/9 x 144/100=20/9 x144/100=16/5=3,2
c) 1,(3)x1,25 =(13-1)/9 x 125/100=12/9x5/4=5/3=1,(6)
d) 0,6x0,8(3) = 6/10 x (83-8)/90=3/5 x 75/90=15/30=1/2
e) 2,0(6)x2,5 =(206-20)/90 x 25/10=186/90 x5/2=93/18=31/6
f) 1,3(8)x1,8 = (138-13)/90 x18/10=125/90 x9/5=25/10=5/2=2,5