2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Ib qho piv txwv ntawm qhov sib txawv thawj zaug (ntawm ib qho sib txawv) yog hu ua qhov tseeb, lossis qhov tseeb sib txawv, yog tias nws yog qhov tshwm sim ntawm qhov sib txawv yooj yim. Qhov sib npaug P(x, y)y′ + Q(x, y)=0 , lossis hauv qhov sib npaug sib npaug P(x, y)dy + Q(x, y) dx=0, is exact if Px(x, y)=Qy(x, y).
Yuav ua li cas yog qhov tseeb ode?
Qee yam piv txwv ntawm qhov sib txawv qhov sib txawv muaj raws li hauv qab no: ( 2xy – 3x 2) dx + (x 2 – 2y) dy=0. (xy2 + x) dx + yx2 dy=0. Cos y dx + (y2 – x sin y) dy=0.
Yuav ua li cas sib npaug sib npaug yog linear thiab meej?
Linear & Exact Equations: Piv txwv nqe lus nug 5
No. Txoj kev sib npaug tsis siv daim ntawv kom raug. Piav: Rau qhov sib npaug sib txawv kom muaj tseeb, ob yam yuav tsum muaj tseeb.
Puas yog qhov sib npaug sib cais?
Ib qho kev txiav txim thawj zaug sib txawv yog qhov tseeb yog tias nws muaj qhov khaws cia. Piv txwv li, sib piv sib cais yeej ib txwm muaj tseeb, txij li lub ntsiab lus lawv yog ntawm daim ntawv: M(y)y + N(t)=0, … yog li ϕ(t, y)=A(y) + B(t) yog ib qho kev txuag ntau.
Koj qhia li cas yog qhov sib npaug sib cais los yog kab?
Linear: Tsis muaj cov khoom lossis lub zog ntawm cov khoom uas muaj y. Piv txwv li y′2 yog lawm. Separable: Qhov sib npaug tuaj yeem muab tso rau hauv daim ntawv dy(qhia muaj ys, tab sis tsis muaj xs, hauv qee qhov sib xyaw koj tuaj yeem sib xyaw)=dx(qhiamuaj xs, tab sis tsis muaj ys, hauv qee qhov sib xyaw ua ke koj tuaj yeem koom ua ke).
Pom zoo:
Qhov twg yog debark yog qhov tseeb?
Raws li verbs qhov txawv ntawm debark thiab disembark yog tias debark yog tshem tawm cov khoom ntawm lub dav hlau lossis nkoj lossis debark tuaj yeem yog (tsob hav zoov) tshem cov tawv ntoo ntawm tsob ntoo uas tau poob thaum lub sij hawm disembark tshem tawm ntawm lub nkoj;
Dab tsi yog qhov tseeb thiab tsis muaj tseeb?
Hauv qhov tseeb, cov neeg ua yeeb yam tau siv zog los tsim cov lus zoo ntawm kev hais lus, nrog rau tag nrho nws cov stumblings, inarticulateness, slang, mispronunciations, thiab qias neeg. Hauv nonrealistic, playwrights siv zog los tsim cov lus uas tsis yog lus txhua hnub.
Qhov twg yog qhov tseeb ci los yog ci ntsa iab?
Shinning yog UK Lus Askiv. US version yog shinny. Nws txhais tau tias nce ib yam dab tsi, zoo li txoj hlua lossis ncej. Ci ntsa iab yog qhov uas lub hnub ua rau ib hnub ntshiab. Lub ntsiab lus ntawm shinning yog dab tsi? Shinning txhais tau tias nce ib yam dab tsi los ntawm kev tuav thiab siv ob txhais ceg, tes thiab caj npab rub lub cev.
Qhov twg hauv qab no yog qhov tseeb tag nrho cov fungi yog filamentous?
Teb tiav: A) Fungi muaj cov qauv filamentous hu ua hyphae. Lub hyphae yog cov saw ntev ntawm cov hlwb koom nrog pib ua kom tiav los ntawm kev sib cais sib cais hu ua septa (septate) lossis tsis muaj septa (aseptate). Txawm li cas los xij, ob peb kab mob xws li Poov xab tsis ua hyphae thiab yog ib leeg-celled.
Thaum twg qhov sib npaug glaister yog qhov tseeb tshaj plaws?
Kev sib luag Glaister yog qhov tseeb tshaj plaws hauv thawj 12 teev tom qab tuag. Vim li cas qhov sib npaug Glaister tsis tuaj yeem ntseeg tau hauv qee qhov xwm txheej? Thaum chav txias dua li qhov kub ntawm lub cev, lub cev yuav maj mam txo qis hauv qhov kub kom txog thaum nws kub hauv chav.
