tolong dijawab no 17, 18 ,19 ,20 pake cara

17.

semangka = 3/5-3 × 8

= 3/2 × 8

= 12 (A)

18.

5,446927

7 diatas 5 = 5,44693

3 dibawah 5 = 5,4469

9 diatas 5 = 5,447

7 diatas 5 = 5,45 (C)

19.

160 cm - 9 dm = m

(160÷100)m - (9÷10)m = m

1,6 m - 0,9m = 0,7 m (D)

20.

S = JP/Js

JP = S × Js

= 1/1250000 cm × 50 km

= 1/1250000 × 5000000

= 4 cm (C)