73 × 74/75= 73×(1 - 1/75)= 73 - 73/75= 72又 2/75
=73×(1-1/75)=73×1-73×1/75=73-73/75=72又75分之2
73x74/75=(75-2)x74/75=75x 74/75-2x 74/75=74-148/75=72 又2/75