1.(7/10+1/2)*8/3-1/5= 6/5*8/3-1/5= 15/5=3
2.8/45*5/8+3/7*28/9=9-4/3=23/3
3.3/10/(2/3)-1/5=3/10 * 3/2 -1/5 =9/20-4/20=1/4
4.(8/15-11/15+9/15)*6=12/5
1.(7/10+1/2)*8/3-1/5= 6/5*8/3-1/5= 15/5=3
2.8/45*5/8+3/7*28/9=9-4/3=23/3
3.3/10/(2/3)-1/5=3/10 * 3/2 -1/5 =9/20-4/20=1/4
4.(8/15-11/15+9/15)*6=12/5