8.33*2.4+4.165*6.7-83.3+20/3=8.33*2.4+4.165*2*3.35-8.33*10+20/3
=8.33*（2.4+3.35-10）+20/3=8.33*（-4.25）+20/3
=25/3*（-17/4）+20/3=-345/12=-115/4=-28.75