Cov txheej txheem:
- Puas kawg yog qhov kawg?
- Puas muaj xwm txheej hauv zos tshwm sim ntawm qhov kawg?
- Cov ntsiab lus kawg puas yog max lossis min?
- Yuav ua li cas paub yog tias muaj tus txheeb ze extrema?
Video: Cov ntsiab lus kawg puas yog qhov sib txawv heev?
2024 Tus sau: Fiona Howard | [email protected]. Kawg hloov kho: 2024-01-10 06:38
Tus txheeb ze extrema tuaj yeem tseem muaj tshwm sim ntawm qhov kawg ntawm tus sau. Piv txwv li, kev ua haujlwm f(x)=x ntawm lub sijhawm [0, 1] muaj qhov txheeb ze tshaj plaws ntawm x=1 thiab tus txheeb ze yam tsawg kawg nkaus ntawm x=0.
Puas kawg yog qhov kawg?
Tsis muaj laj thawj xav tias qhov kawg ntawm lub sijhawm yuav yog cov ntsiab lus tseem ceeb ntawm txhua yam. Yog li ntawd, peb tsis pub cov txheeb ze extrema muaj nyob rau ntawm qhov kawg ntawm lub sijhawm.
Puas muaj xwm txheej hauv zos tshwm sim ntawm qhov kawg?
Thaum f tau txhais ntawm lub sijhawm kaw, tsis muaj lub sijhawm qhib uas muaj qhov kawg ntawm lub sijhawm kaw uas f tau txhais. Li no, ib qho txiaj ntsig hauv cheeb tsam tsis tuaj yeem tshwm sim ntawm qhov kawg ntawm lub sijhawm ntawm kev sau npe.
Cov ntsiab lus kawg puas yog max lossis min?
Cov lus teb tom qab muaj qhov taw tes (1, 1), uas yog qhov kawg. Raws li cov lus txhais hauv phau ntawv kawm, kuv xav tias qhov kawg tsis tuaj yeem yog qhov tsawg kawg nkaus hauv zos lossis qhov siab tshaj plaws muabtias lawv tsis tuaj yeem nyob rau lub sijhawm qhib uas muaj lawv tus kheej. (piv txwv li: lub sijhawm qhib (1, 3) tsis muaj 1).
Yuav ua li cas paub yog tias muaj tus txheeb ze extrema?
Kev piav qhia: Rau ib qho kev ua haujlwm, txheeb ze extrema, lossis hauv zos maxima thiab minima, tuaj yeem txiav txim siab los ntawm siv thawj qhov kev xeem derivative, uas tso cai rau koj kuaj xyuas qhov kev hloov pauv ntawm f′ ib ncig ntawm lub luag haujlwm cov ntsiab lus tseem ceeb.
Pom zoo:
Puas yog cov lus sib dhos thiab cov lus sib txawv?
Synonyms yog cov lus uas muaj tib yam, lossis yuav luag tib yam, txhais tau tias yog lwm lo lus. Antonyms yog cov lus uas muaj lub ntsiab lus sib txawv ntawm lwm lo lusXaiv cov lus zoo sib xws ua kom koj cov ntawv sau. Kev kawm cov lus antonyms ua rau koj qhov kev nkag siab ntawm cov lus thiab nthuav koj cov lus .
Puas yog piv txwv ntawm qhov sib txawv ntawm qhov sib txawv ntawm cov khoom siv hluav taws xob?
Piv txwv rau cov khoom siv tsis ncaj band sib txawv yog silicon (Si), germanium (Ge), aluminium arsenide (AlAs) thiab gallium phosphide (GaP) . Yuav ua li cas piv txwv ntawm indirect band gap? Piv txwv ntawm cov ntaub ntawv ncaj qha muaj xws li amorphous silicon thiab qee cov khoom siv III-V xws li InAs thiab GaAs.
Pfaffian qhov sib txawv qhov sib txawv yog dab tsi?
Daim ntawv dav dav ntawm Pfaffian equations hauv ob qhov sib txawv x thiab y yog P dx + Qdy=0, qhov twg P=P(x, y) thiab Q=Q(x, y) yog cov haujlwm ntawm x thiab y. … Yog hais tias peb tuaj yeem nrhiav cov haujlwm f=f (x, y) thiab g=g(x, y) xws li ω=gdf, ces ω=0 tuaj yeem raug txo kom df=0 nrog kev daws f(x, y)=c (c yog qhov tsis tu ncua) .
Leej twg yog cov lus sib piv thiab cov lus sib txawv?
Synonyms yog cov lus uas muaj tib yam, lossis yuav luag tib yam, txhais tau tias yog lwm lo lus. Antonyms yog cov lus uas muaj lub ntsiab lus ntawm lwm tus lo lus. Kev xaiv qhov zoo sib xws ua kom zoo rau koj cov ntawv sau . Kuv tuaj yeem nrhiav cov lus sib piv thiab cov lus sib txawv nyob qhov twg?
Rau cov roj zoo tagnrho uas qhov sib txawv yog qhov sib txawv ntawm qhov sib txawv?
Boyle txoj cai hais tias siab (P) thiab ntim (V) yog qhov sib npaug. Charles txoj cai hais tias ntim (V) thiab qhov kub thiab txias (T) ncaj qha proportional . Txoj cai roj twg yog qhov sib npaug sib npaug? Rau qhov loj ntawm cov roj zoo tagnrho khaws cia ntawm qhov kub thiab txias, siab thiab ntim yog qhov sib npaug.
