bantu saya dong kakak..

3. 7,6 - 3,9 + 2,4
= 7,6 - 1,5
= 6,1

4. 3/7 × 2/9
= 1/7 × 2/3
= 2/21

5. 2 1/6 : 1/3
= 13/6 × 3
= 13/2
= 6 1/2

3. 6,1
4. 2/21
5. = 13/6 ÷ 1/3 
    = 13/6×3/1
    = 13/2 = 6 1/2