Lub vertex ntawm parabola yog lub ntsiab lus uas tus parabola hla nws cov axis ntawm symmetry. Yog hais tias tus coefficient ntawm x2 lub sij hawm yog qhov zoo, lub vertex yuav yog qhov qis tshaj ntawm daim duab, taw tes rau hauv qab ntawm "U"-zoo li.
Dab tsi yog daim duab vertex?
"Vertex" yog ib lo lus rau a ntawm daim duab, piv txwv li, ib qho ntawm cov ntsiab lus ntawm cov duab tau txhais thiab uas tej zaum yuav txuas nrog cov duab npoo.
qhov vertex nyob rau hauv daim ntawv vertex nyob qhov twg?
Thaum sau ua "vertex form": (h, k) yog lub vertex ntawm parabola, thiab x=h yog axis ntawm symmetry. tus h sawv cev rau txoj kab rov tav hloov (sab laug, lossis sab xis, daim duab tau hloov ntawm x=0).tus k sawv cev rau txoj kev hloov ntsug (qhov deb npaum li cas, lossis nqes, daim duab tau hloov ntawm y=0).
Dab tsi yog vertex formula?
Cov qauv Vertex ntawm parabola yog siv los nrhiav cov kev sib koom tes ntawm qhov chaw uas parabola hla nws axis ntawm symmetry. Lub vertex yog lub ntsiab lus (h, k). Raws li peb paub tus qauv sib npaug ntawm parabola yog y=ax 2+bx+c.
piv txwv vertex yog dab tsi?
Vertex feem ntau txhais tau tias ib ces kaum lossis ib qho chaw uas kab sib ntsib. Piv txwv li ib lub square muaj plaub fab, txhua qhov hu ua vertex.
