1.4×... = 16 × 1/2 2.2×... = 36:3 3.(1/2×...) -25 = 25×17 4.(10:1/2)×... = 120 5.(1/5×...)-10 = 5×4 Pakai Caranya Ya Pliss.... :-) ... <3

a = ...

1. 4 × a = 16 × 1/2
4a = 8
a = 8/4 = 2

2. 2 × a = 36 : 3
2a = 12
a = 12/2 = 6

3. (1/2 × a) - 25 = 25 × 17
1/2a - 25 = 425
1/2a = 425 + 25
1/2a = 450
a = 450 × 2/1
a = 900

4. (10 : 1/2) × a = 120
(10 x 2/1) x a = 120
20a =120
a = 120/20 = 60

5. ( 1/5 × a ) - 10 = 5 × 4
1/5a - 10 = 20
1/5a = 20+10
1/5a = 30
a = 30 x 5/1
a = 150