3 teeb meem thiab kev daws teeb meem txog qhov sib npaug ntawm qhov ceev
1. Ib lub tsheb mus rau sab qab teb li 100 m hauv 1 feeb ces tig mus rau sab hnub tuaj li 120 m hauv 0.5 feeb. Xam qhov ceev nruab nrab ntawm lub tsheb.
Paub:
Tag nrho qhov deb = 100 meters + 120 meters = 220 meters
Tag nrho lub sijhawm = 1 feeb + 0.5 feeb = 1.5 feeb = 90 vib nas this
SE pob: Qhov nruab nrab nrawm
tshuaj:
Cov mis ceev
Qhov nruab nrab ntawm qhov ceev = tag nrho qhov deb: tag nrho lub sijhawm = 220 meters: 90 vib nas this = 2.4 meters/ib pliag
2. Ib lub nkoj uas mus ncaj nraim li ntawm 100 meters tom qab 10 vib nas this. Qhov ceev nruab nrab ntawm lub nkoj yog dab tsi?
Paub:
Qhov Nrug = 100 meters
Lub sijhawm = 10 vib nas this
xav: Qhov nruab nrab nrawm
tshuaj:
Cov mis ceev
Qhov nruab nrab ceev = 100 meters: 10 vib nas this = 10 meters/ib vib nas this
3. Ib lub khoom me me txav ntawm qhov chaw O mus rau qhov chaw B hauv 4 vib nas this thiab ntawm B mus rau A hauv 20 vib nas this. Txheeb xyuas qhov nruab nrab ntawm cov khoom me me.
Paub Tias:
Qhov deb ntawm OB = 5 meters
Qhov deb ntawm BA = 8 meters
Lub sijhawm ntawm OB = 4 vib nas this
Lub Sijhawm BA = 20 vib nas this
SE pob: Qhov nruab nrab ntawm cov khoom me me
tshuaj:
Cov mis ceev
Qhov nruab nrab ntawm cov khoom me me = tag nrho qhov deb: tag nrho lub sijhawm = (5 + 8): (4 + 20) = 13: 24 = 0.54 meters/ib pliag
