5.dm-75cm==........mm

5 dm - 75 cm
= (5 × 100) - (75 × 10)
= 500 - 750
= (-250) mm

1 dm = 100 mm
5 dm = 100 × 5 = 500 mm

1 cm = 10 mm
75 cm = 75 × 10 = 750 mm

Maka , 500 - 750 = - 250 mm

Semoga Membantu :) Maaf kalo slh
``»•^°Mystic°^•«``