tolong bantu besok di tumpuk

1. 84/100 = 21/25
2. 18/48 = 3/4 = 0,75
3. 0,20 = 1/5
4. (3/4)×480 = 3×120 = 360
5. lupa sorry
6. (10/21)+(2/7) = (10/21)+(6/21) = 16/21 
7. (1/3)-(1/4)+(1/2) = (4/12)-(3/12)+(6/12) = 7/12
8. (15/16)×(4/5):(1/2) = (3/4)÷(1/2) = (3/4)×2 = 3/2
9. Danar : Karina = 14:12 = 7:6
10. p sebenarnya = 12×500 =  6000cm alias 60 m
      l sebenarnya = 5×500 = 2500 cm alias 25 m
      L sebenarnya = 60×25 = 1500 m²