Koj sau li cas ntawm qhov tsis sib xws?
Koj sau li cas ntawm qhov tsis sib xws?

Video: Koj sau li cas ntawm qhov tsis sib xws?

Video: Koj sau li cas ntawm qhov tsis sib xws?
Video: Tsis Yog Hmoob Sib Ntxhais Ntxawm - SODA Poj Laib Khej Me (Cover) 2024, Kaum ib hlis
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Raws li ib kev tsis sib xws , peb xav sau Nyeem raws li "tus sau npe ntawm kev ua haujlwm yog tag nrho cov txiaj ntsig ntawm x uas ntau dua lossis sib npaug rau xoom". kev tsis sib xws saib Kev tsis sib xws . Nyob rau hauv thiaj li hu ua interval notation, tib lub luag hauj lwm muaj a sau npe ntawm Qhov no piav qhia txog cov txiaj ntsig ntawm 0 mus rau qhov zoo infinity.

Tsis tas li ntawd, koj yuav ua li cas thiaj nrhiav tau qhov kev tsis sib xws?

Rau nrhiav tus sau , daws kev tsis sib xws 4 - x > 0. x < 4. Yog li, txhua tus lej tsawg dua lossis sib npaug rau 4 sawv cev rau sau npe rau qhov haujlwm no. Thaum sim nrhiav tus sau thiab ntau los ntawm ib daim duab, lub sau npe yog pom los ntawm saib daim duab ntawm sab laug mus rau sab xis.

Tom qab ntawd, lo lus nug yog, dab tsi yog qhov sau npe hauv kev ua haujlwm? Cov sau npe ntawm a muaj nuj nqi yog qhov ua tiav cov txiaj ntsig tau ntawm qhov kev hloov pauv ywj pheej. Hauv lus Askiv dawb, qhov txhais no txhais tau tias: The sau npe yog cov txheej txheem ntawm txhua qhov ua tau x-tus nqi uas yuav ua rau muaj nuj nqi "ua haujlwm", thiab yuav tso tawm cov txiaj ntsig tiag.

Kuj Paub, ua li cas koj sau ib tug sau nyob rau hauv lub sij hawm notation?

Nws yog qhov yooj yim dua, feem ntau, saib qhov sib npaug ntawm qhov muaj nuj nqi thiab txheeb xyuas nws sau npe tshaj nws yog kom paub txog nws qhov ntau. Piv txwv li, coj f(x)=x+2x−3. Peb tuaj yeem pom tias nws sau npe yog txhua tus lej tiag tsuas yog 3. Hauv interval notation uas yog sau (−∞, 3)∪(3, ∞).

Qhov ntau ntawm kev tsis sib xws yog dab tsi?

Ntau yam yog cov txheej txheem ntawm tag nrho cov txiaj ntsig y, qhov nyob ntawm qhov ntau, uas yuav tshwm sim los ntawm kev hloov tag nrho x qhov tseem ceeb (tus sau) rau hauv txoj haujlwm. Yog li cov ntau ntawm f(x) = 2x + 3 kuj yog tag nrho cov lej tiag, vim tias txawm tias tus nqi ntawm x yog dab tsi, peb tuaj yeem muab tus lej ntawd los ntawm 2 thiab ntxiv 3.

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