2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov axis ntawm symmetry ib txwm dhau los ntawm vertex ntawm parabola. X-coordinate of the vertex yog qhov sib npaug ntawm cov axis ntawm symmetry ntawm parabola. Rau ib qho kev ua quadratic hauv cov qauv, y = ax2 + bx + c, axis ntawm symmetry yog kab ntsug x = −b2a.
Raws li txoj cai, koj yuav pom qhov vertex thiab axis ntawm symmetry li cas?
Cov Vertex Daim ntawv ntawm kev ua haujlwm plaub yog muab los ntawm: f(x) = a(x−h)2+k, qhov twg (h, k) yog Vertex ntawm parabola. x = h yog axis ntawm symmetry . Siv ua tiav txoj kev square los hloov f(x) rau hauv Vertex Daim ntawv.
Ib sab saum toj, dab tsi yog A hauv daim ntawv vertex? y = a(x – h)2 + k, qhov twg (h, k) yog qhov vertex . Qhov "a" hauv qhov vertex daim ntawv yog tib "a" as. hauv y = ax2 + bx + c (uas yog, ob qho tib si a's muaj qhov zoo ib yam). Daim paib ntawm "a" qhia koj seb lub quadratic qhib lossis qhib.
Thiab cov lus nug yog, dab tsi yog vertex thiab axis ntawm symmetry?
Daim duab ntawm ib qho kev ua quadratic yog parabola. Cov axis ntawm symmetry ntawm parabola yog ib txoj kab ntsug uas faib cov parabola rau hauv ob qho tib si sib xyaw. Cov axis ntawm symmetry ib txwm dhau los ntawm vertex ntawm parabola. X-coordinate of the vertex yog qhov sib npaug ntawm cov axis ntawm symmetry ntawm parabola.
Dab tsi yog qhov vertex ntawm daim duab?
Cov vertex ntawm parabola yog qhov point uas parabola hla nws axis ntawm symmetry. Yog hais tias tus coefficient ntawm x2 lub sij hawm yog qhov zoo, lub vertex yuav yog qhov qis tshaj ntawm qhov daim duab , qhov taw tes hauv qab ntawm "U"-zoo li. Hauv qhov sib npaug no, lub vertex ntawm parabola yog qhov point (h, k).
Pom zoo:
Yuav ua li cas koj pom lub kaum sab xis nruab nrab muab qhov chaw thiab lub vojvoog ntawm ib lub sector?
Kev txiav txim siab Central Angle Los ntawm Sector Area (πr2) × (central angle in degrees ÷ 360 degrees) = sector area. Yog hais tias lub hauv paus lub kaum sab xis ntsuas nyob rau hauv radians, lub mis hloov mus ua: sector cheeb tsam = r2 × (central kaum hauv radians ÷ 2). (θ ÷ 360 degree) × πr2. (52.3 ÷ 100π) × 360. (52.3 ÷ 314) × 360
Vim li cas nws thiaj li hu ua X axis thiab Y axis?
Kab rov tav axis hu ua x-axis. Lub axis ntsug yog hu ua y-axis. Lub ntsiab lus uas lub x-axis thiab y-axis sib tshuam yog hu ua lub hauv paus. Txhua lub ntsiab lus tuaj yeem txheeb xyuas los ntawm tus lej xaj; uas yog, tus lej ntawm x-axis hu ua x-coordinate, thiab tus lej ntawm y-axis hu ua y-coordinate
Yuav ua li cas koj pom lub vertex thiab Directrix?
Tus qauv qauv yog (x - h) 2 = 4p (y - k), qhov kev tsom xam yog (h, k + p) thiab directrix yog y = k - p. Yog hais tias lub parabola tig kom nws vertex yog (h, k) thiab nws axis ntawm symmetry yog parallel mus rau lub x-axis, nws muaj ib tug sib npaug ntawm (y - k) 2 = 4p (x - h), qhov chaw tsom yog (h + p, k) thiab directrix yog x = h - p
Yuav ua li cas koj pom lub vertex ntawm kab rov tav parabola?
Yog hais tias ib tug parabola muaj ib tug kab rov tav axis, tus qauv qauv ntawm qhov sib npaug ntawm parabola yog qhov no: (y -k) 2 = 4p (x - h), qhov twg p≠ 0. Lub vertex ntawm no parabola yog ntawm (h, k). Kev tsom xam yog nyob ntawm (h + p, k). Thedirectrix yog kab x = h - p
Yuav ua li cas koj yuav soj ntsuam cov nyhuv ntawm lub teeb siv ntawm tus nqi ntawm photosynthesis?
Cov nyhuv ntawm lub teeb siv ntawm photosynthesis tuaj yeem tshawb xyuas hauv cov nroj tsuag dej. Qhov kev siv lub teeb yog proportional rau qhov kev ncua deb - nws yuav txo qis raws li qhov deb ntawm lub teeb nce - yog li lub teeb siv rau kev tshawb nrhiav tuaj yeem sib txawv los ntawm kev hloov qhov kev ncua deb ntawm lub teeb mus rau cov nroj tsuag