Dau coroana ex 10 a)

Răspuns:
Explicație pas cu pas:
1 si 1/3=4/3
1 si 1/2=3/2
(4/3:8/9)/(3/2:2/5):8/15=(4/3*9/8)/3/2*5/2)*15/8=(3/2)/(15/4)*15/8=(3/2*4/15)*15/8= 2/5*15/8=3/4