1). 5/8*7/10=1/8*7/2=7/16.
1/3*9/10=1*3/10=3/10.
2. 25/100*38.6=9.65
jumatate (50/100) din 45/100*540=50/100*243=243/2(sau 121,5)
3.Ai folosit ^ pentru inmultire? Daca da, atunci va veni: (3n+2+3n)/(2n+3+2n+1)= (6n+2)/(4n+4) => dai factor comun 2:
2(3n+1)/2(2n+2)=> (3n+1)/(2n+2)
La ultimul nu cred ca asta e tot, acea fractie e deja ireductibila