Răspuns:
3/8
Explicație pas cu pas:
15:5/3=15x3/5=45/5=9
2x2x2=8
1+1/3=3/3+1/3=4/3
1/4x4/3=1/3
Deci 9/8=x/1/3
x=1/3x9/8=3/8