Video: Yuav ua li cas koj kos ib lub conic ntawm ib tug parabola?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov directrix yog kab y = k - p. Lub axis yog kab x = h. Yog tias p> 0, lub parabola qhib upward, thiab yog p <0, lub parabola qhib nqes. Yog ib parabola muaj kab rov tav axis, tus qauv daim ntawv ntawm qhov sib npaug ntawm cov parabola yog qhov no: (y - k)2 = 4p(x - h), p≠ 0.
Tsis tas li ntawd, dab tsi yog conic seem parabola?
< Conic Sections . 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.
Qhov thib ob, koj yuav txheeb xyuas qhov conic li cas? Yog hais tias lawv yog, ces cov yam ntxwv no yog raws li nram no:
- Lub voj voog. Thaum x thiab y yog ob qho tib si squared thiab cov coefficients ntawm lawv yog tib yam - nrog rau cov kos npe.
- Parabola. Thaum twg x lossis y yog squared - tsis yog ob qho tib si.
- Ellipse. Thaum x thiab y yog ob qho tib si squared thiab cov coefficients zoo tab sis txawv.
- Hyperbola.
Kuj paub yog, qhov sib npaug ntawm parabola yog dab tsi?
Muab qhov tsom xam (h, k) thiab directrix y = mx + b, the kev sib npaug rau a parabola yog (y - mx - b)^2 / (m^2 + 1) = (x - h)^2 + (y - k)^2.
Yuav ua li cas yog parabola tsim?
A parabola yog qhov nkhaus tsim los ntawm kev sib tshuam ntawm lub dav hlau thiab lub khob hliav qab, thaum lub dav hlau nyob ntawm tib lub slant ib sab ntawm lub khob hliav qab.
Pom zoo:
Yuav ua li cas koj cais ib tug sib tov ntawm pigments los ntawm ib tug number case cartridge?
Txhawm rau cais qhov sib xyaw ntawm cov xim uas yog ob lub dyes, daim ntawv chromatography yog siv. Ib feem me me ntawm qhov sib tov yog muab tso rau hauv cov khoom siv absorbent, ib daim ntawv lim, nrog cov kuab tshuaj. Ob lub dyes yuav txav mus rau nyias thiab tus number case yuav sib cais rau hauv nws cov khoom ntshiab
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 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."
Yuav ua li cas ua ib tug conic seem ntawm parabola?
Yog hais tias ib tug parabola muaj ib tug ntsug axis, tus qauv qauv ntawm qhov sib npaug ntawm 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