tolong yah pake cara nomor 1 dan 2

no.1
42,195 km-7.250 m=…dam
42,195 km=4219,5 dam
7.250 m=725 dam
=4219,5-725=3.494,5 (B)
no.2
1/2 ton-4,5 kuintal-40 kg=…kg
1/2 ton=500 kg
4,5 kuintal=450 kg
=500-450-40=10 kg(A)