3 1 / 8 -2 2 /3 + 1/2

3(1/8)-2(2/3)+1/2=

=(25/8)-(8/3)+(1/2)=

=(25*3)/(8*3) - (8*8)/(3*8) + (1*12)/(2*12)=

=(75/24)-(64/24)+(12/24)=

=(75-64+12)/24=

=23/24