Le simplifici tu .. in prima paranteza prima cu 6 si a doua cu 5 .. in a doua paranteza prima cu 5 si a doua cu 4 .. deci ..
[(6-5/90)÷1/45+1/60÷(5-4/60)÷3/2=
1/90÷1/45+1/60÷1/60÷3/2=
1/90×45/1-1/60×60/1×2/3=
1/2×1/1-1/1×1/1×2/3=
1/2-1/1×2/3=
1/2-2/3=
3-4/6=
-1/6
Sper ca e bine asa !
