1)

(3 1/3÷5 1/6)×2/5-2 3/4÷(1 1/2-2/5)=9/10

1. 3 1/3+5 1/6=8 1/2

2. 1 1/2-2/5=1 1/10

3. 8 1/2×2/5=3 2/5

4. 2 3/4÷1 1/10=2 1/2

5.3 2/5-2 1/2=9/10

3)

(1/8+2/9-1/4)×5 1/7÷(7/9-2/3)+1/6=4 2/3

1. 1/8+2/9=25/72

2. 25/72-1/4=7/72

3. 7/9-2/3=1/9

4. 7/72×5 1/7=1/2

5. 1/2÷1/9=4 1/2

6. 4 1/2+1/6=4 2/3