a-b=36
a) a=2xb
metoda grafica
b I----I{__}-DIFERENTA=36
a I----I----I
a=2x36=72
b=36
b) a I---I---I---I
b I---I{___}
diferenta=36
36:2=18(b)
3x18=54(a)
c) a I----I----I----I----I
b I----I{_______}
diferenta=36
36:3=12(b)
4x12=48(a)
d) a I---I---I---I---I---I
b I---I{________}
dif.=36
36:4=9(b)
5x9=45(a)