4 Piv txwv ntawm cov lus nug txog qhov deb thiab kev hloov chaw
1. Ib lub tsheb txav mus ncaj nraim rau sab hnub tuaj li 100 meters thiab tom qab ntawd txav mus ncaj nraim rau sab hnub poob li 50 meters. Txheeb xyuas qhov deb thiab kev hloov chaw ntawm lub tsheb los ntawm nws qhov chaw pib.
Kev Sib Tham
Qhov Nrug = 100 meters + 50 meters = 150 meters
Qhov ntau ntawm kev hloov chaw = 100 meters - 50 meters = 50 meters thiab qhov kev hloov chaw yog mus rau sab hnub tuaj.
2. Ib tug tub ntxhais kawm taug kev 4 meters mus rau sab hnub tuaj thiab tom qab ntawd tig mus rau sab qaum teb rau 3 meters. Txheeb xyuas qhov deb thiab kev hloov chaw ntawm tus tub ntxhais kawm ntawm qhov chaw pib.
Kev Sib Tham
Qhov Nrug = 4 meters + 3 meters = 7 meters
Qhov loj ntawm kev hloov chaw = qhov ntev ntawm lub hypotenuse = = meters.
Qhov kev taw qhia ntawm kev txav mus los yog sab qaum teb sab hnub tuaj (kev taw qhia ntawm tus xub txiv kab ntxwv).
3. Saib daim duab hauv qab no! Ib tug neeg tab tom ncig ib daim teb plaub fab. Ntev = 50 meters, dav = 20 meters. Tom qab ncig daim teb ob zaug, tus neeg ntawd rov qab mus rau lawv qhov chaw qub. Txheeb xyuas qhov deb thiab kev hloov chaw ntawm tus neeg.
Kev Sib Tham
Qhov ncig ntawm daim teb = 2 (50 meters) + 2 (20 meters) = 100 meters + 40 meters = 140 meters.
Lub teb raug puag ncig 2 zaug = 2(140 meters) = 280 meters.
Qhov Nrug = 280 meters.
Tom qab mus ncig teb chaws tas, tus neeg ntawd rov qab mus rau nws qhov chaw qub vim yog qhov ntawd. kev hloov pauv = 0 meters.
4. Ib tug neeg yuav tawm hauv tsev nrog lub maus taus. Thaum nws tawm mus, lub speedometer qhia 10.500 km. Tom qab rov qab los tsev, lub speedometer ntawm lub maus taus qhia 10.700 km. Txheeb xyuas qhov deb thiab kev hloov chaw ntawm tus neeg!
Kev Sib Tham
Qhov sib txawv ntawm cov lej ntawm lub speedometer = 10.700 km - 10.500 km = 200 km.
Qhov Nrug Deb = 200 km.
Tom qab mus ncig teb chaws tas, tus neeg ntawd rov qab mus rau nws lub tsev (qhov chaw qub) kom kev hloov chaw = 0 km.
Cov lus nug txog qhov deb thiab kev hloov chaw
1. Ib lub tsheb txav mus ncaj nraim rau sab hnub tuaj li 80 meters thiab tom qab ntawd txav mus ncaj nraim rau sab hnub poob li 60 meters. Txheeb xyuas qhov deb thiab kev hloov chaw ntawm lub tsheb los ntawm nws qhov chaw pib.
2. Ib tug tub ntxhais kawm taug kev 8 meters mus rau sab hnub tuaj thiab tom qab ntawd tig mus rau sab qaum teb rau 6 meters. Txheeb xyuas qhov deb thiab kev hloov chaw ntawm tus tub ntxhais kawm ntawm qhov chaw pib.
3. Saib daim duab hauv qab no! Ib tug neeg tab tom ncig ib daim teb plaub fab. Ntev = 100 meters, dav = 50 meters. Tom qab ncig daim teb peb zaug, tus neeg ntawd rov qab mus rau lawv qhov chaw qub. Txheeb xyuas qhov deb thiab kev hloov chaw ntawm tus neeg.
4. Ib tug neeg yuav tawm hauv tsev nrog lub maus taus. Thaum nws tawm mus, lub speedometer qhia 11.600 km. Tom qab rov qab los tsev, lub speedometer ntawm lub maus taus qhia 11.900 km. Txheeb xyuas qhov deb thiab kev hloov chaw ntawm tus neeg!
[Lus Askiv: Kev ncua deb thiab kev hloov chaw - teeb meem thiab kev daws teeb meem]
