急.............................................................

8km－5km60m
=8千米-5.06千米
=2.94千米

2t9kg＋450kg
=2.009吨+0.45吨
=2.459吨

1.8km-5km60m=8000m-5060m=2940m
2.2t9kg+450kg=2009kg+450kg=2459kg

8km－5km60m =2km940m
2t9kg＋450kg=2t459kg

2.94km
2.459t

1 8km=8000m 5km60m=5060m 8km－5km60m=2940m

2 2t=2000kg 2t9kg＋450kg=2009+450=2459kg

(1)2KM340M
(2)1T559KG