Video: Yuav ua li cas ua ib tug conic seem ntawm parabola?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Yog ib parabola muaj ib tug ntsug axis, tus qauv daim ntawv ntawm cov kab zauv ntawm lub parabola yog qhov no: (x - h)2 = 4p(y - k), qhov twg p≠ 0. Lub vertex ntawm no parabola yog ntawm (h, k). Kev tsom xam yog nyob ntawm (h, k + p). Cov directrix yog kab y = k - p.
Tib neeg kuj nug, puas yog parabola ib ntu conic?
Cov parabola yog lwm tus paub conic seem . Geometric txhais ntawm a parabola yog qhov chaw ntawm tag nrho cov ntsiab lus xws li tias lawv sib npaug ntawm qhov taw tes, hu ua kev tsom, thiab ib txoj kab ncaj nraim, hu ua directrix. Hauv lwm lo lus, eccentricity ntawm a parabola yog 1.
Tsis tas li ntawd, 4 hom conic seem yog dab tsi? Plaub ntu conic yog lub voj voog , ellipses, parabolas, thiab hyperbolas. Conic Sections tau kawm ntev heev. Kepler thawj zaug pom tias cov ntiaj chaw muaj elliptical orbits. Nyob ntawm lub zog ntawm lub cev orbiting, cov duab orbit uas yog ib qho ntawm plaub hom conic seem tuaj yeem ua tau.
Ib yam li ntawd, koj yuav ua li cas ua ib qho conic seem?
Conic ntu yog tsim los ntawm kev sib tshuam ntawm lub dav hlau nrog lub khob hliav qab. Yog hais tias lub dav hlau yog parallel mus rau lub axis ntawm kiv puag ncig (lub y -axis), ces tus conic seem yog hyperbola. Yog hais tias lub dav hlau yog parallel mus rau lub generating kab, lub conic seem yog parabola.
Tus qauv qauv ntawm parabola yog dab tsi?
f (x) = a(x - h)2 + k, qhov twg (h, k) yog lub vertex ntawm tus parabola . FYI: Cov phau ntawv sib txawv muaj kev txhais lus sib txawv ntawm kev siv " txheem daim ntawv Ib txhia hais tias f (x) = ax2 + bx + c yog " txheem daim ntawv ", thaum lwm tus hais tias f (x) = a(x - h)2 +k yog " txheem daim ntawv ".
Pom zoo:
Yuav ua li cas koj nrhiav tau tus ntoo khaub lig seem ntawm ib tug square?
VIDEO Ua kom pom qhov no, dab tsi yog qhov hla ntawm lub square? Hla ntu . A hla ntu yog cov duab peb tau txais thaum txiav ncaj los ntawm ib yam khoom. Cov hla ntu ntawm cov khoom no yog daim duab peb sab. Nws zoo li kev pom rau sab hauv ntawm ib yam dab tsi uas tau txiav los ntawm nws.
Yuav ua li cas yog ib tug piv txwv ntawm ib tug rational naj npawb uas tsis yog ib tug tag nrho?
Tus lej "rational" yog qhov piv ntawm ob tus lej. Piv txwv li, cov hauv qab no yog cov lej rational, thiab tsis muaj leej twg yog tus lej: 1 / 2. 2 / 3
Yuav ua li cas koj kos ib lub conic ntawm ib tug parabola?
Cov directrix yog kab y = k - p. Lub axis yog kab x = h. Yog tias p> 0, parabola qhib rau sab saud, thiab yog tias p <0, parabola qhib downward. Yog hais tias ib tug parabola muaj ib tug kab rov tav axis, tus qauv daim ntawv ntawm qhov sib npaug ntawm parabola yog qhov no: (y - k) 2 = 4p (x - h), qhov twg p≠ 0
Yuav ua li cas koj nrhiav tau qhov chaw ntawm lub voj voog nyob rau hauv ib tug conic seem?
Tus nqi ntawm r yog hu ua 'radius' ntawm lub voj voog, thiab qhov taw tes (h, k) hu ua 'center' ntawm lub voj voog. (h, k) = (0, 0), ces qhov sib npaug simplifiesto x2 + y2 = r2
Yuav ua li cas ib tug geologist yuav qhia tau hais tias ib tug quav yog ib tug syncline thiab anti-line?
Geologic Structures (Part 5) Anticlines yog folds nyob rau hauv uas txhua ib nrab ntawm cov quav dips deb ntawm lub crest. Synclines yog folds nyob rau hauv uas txhua ib nrab ntawm cov quav dips mus rau lub trough ntawm lub quav. Koj tuaj yeem nco qab qhov sib txawv los ntawm kev ceeb toom tias anticlines tsim "A" zoo, thiab synclines tsim hauv qab ntawm "S."