Răspuns:
28/31×[1/4+(2 intregi si 1/2-7/4):7/8]=
28/31×[1/4+(5/2-7/4):7/8]=
28/31×(1/4+3/4*8/7)=
28/31×(1/4+24/28)
28/31×31/28=1/1=1
