Video: Koj pom qhov kev ntxub ntxaug thiab qhov xwm txheej ntawm cov hauv paus hniav li cas?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov neeg ntxub ntxaug (EMBFQ)
Qhov no yog qhov nthuav qhia nyob rau hauv lub square hauv paus nyob rau hauv lub quadratic formula. Cov neeg ntxub ntxaug txiav txim qhov xwm ntawm keeb kwm ntawm ib tug quadratic equation. Lo lus ' xwm ' yog hais txog hom lej tus keeb kwm tuaj yeem yog - xws li tiag, rational, irrational lossis kev xav.
Ib yam li ntawd, koj yuav ua li cas thiaj nrhiav tau tus naj npawb ntawm cov hauv paus hniav nyob rau hauv ib qho kev sib npaug quadratic?
Cov tus lej ntawm tiag cov hauv paus hniav ntawm ib qho kev sib npaug quadratic nyob ntawm qhov Discriminant ntawm qhov ntawd kev sib npaug . Tam sim no, yog ax^2 + bx + c = 0 kev sib npaug , ces nws qhov kev ntxub ntxaug yuav yog (b^2 - 4ac)^1/2. Yog li, yog tias b^2 - 4ac> 0, ces tus kev sib npaug yuav muaj ob tug tiag tiag keeb kwm.
dab tsi yog lub hauv paus ntawm kev sib npaug? Cov keeb kwm ntawm ib txoj haujlwm yog x-intercepts. Los ntawm kev txhais, y-coordinate ntawm cov ntsiab lus dag ntawm x-axis yog xoom. Yog li ntawd, nrhiav tus keeb kwm ntawm ib lub quadratic muaj nuj nqi, peb teem f (x) = 0, thiab daws qhov kev sib npaug , ax2 bx + c = 0.
Ib yam li ntawd, nws yog nug, dab tsi yog cov hauv paus hniav?
Teb Lub Peb Hlis 12, 2016. The xwm ntawm cag tsuas yog qeb nyob rau hauv uas lub keeb kwm poob rau. Cov keeb kwm tuaj yeem xav txog, tiag, tsis sib npaug lossis sib npaug. Hauv quadratics, lub xwm ntawm cag tuaj yeem tau txais los ntawm kev sib cais ntawm qhov sib npaug ntawm plaub fab.
Dab tsi yog qhov tseeb thiab cov cag?
Hauv tiag txhais tau hais tias cov kev daws teeb meem yuav tsum nyob rau hauv cov txheej txheem. Qhov txawv txhais tau hais tias cov kev daws teeb meem tsis sib npaug.
Pom zoo:
Lub sijhawm ncua sijhawm twg yog sawv cev los ntawm Kev Tsis Pom Zoo ntawm lub hauv paus ntawm pob zeb txheej G?
Yuav ua li cas lub sij hawm luv luv yog sawv cev los ntawm qhov tsis sib haum xeeb ntawm lub hauv paus ntawm pob zeb txheej G? Los ntawm 75 mus rau 150 lab xyoo 9
Yuav ua li cas koj pom cov hauv paus kev xav uas siv Descartes txoj cai ntawm cov paib?
Descartes txoj cai ntawm cov paib hais tias tus naj npawb ntawm cov hauv paus hniav zoo sib npaug rau kev hloov pauv ntawm f(x), lossis tsawg dua li ntawm tus lej sib npaug (yog li koj yuav rho tawm 2 mus txog thaum koj tau txais 1 lossis 0). Yog li ntawd, yav dhau los f(x) tej zaum yuav muaj 2 lossis 0 cov hauv paus zoo. Cov hauv paus hniav tsis zoo
Cov kab mob dab tsi nyob hauv cov hauv paus hniav ntawm cov nroj tsuag?
Cov kab mob hauv paus muaj txiaj ntsig txhawb cov nroj tsuag kev loj hlob thiab muab kev tiv thaiv los ntawm cov kab mob. Lawv feem ntau yog rhizobacteria uas yog Proteobacteria thiab Firmicutes, nrog ntau yam piv txwv los ntawm Pseudomonas thiab Bacillus genera. Rhizobium hom colonize legume keeb kwm tsim cov qauv nodule
Koj pom li cas pH ntawm qhov sib npaug ntawm cov kua qaub thiab lub hauv paus muaj zog?
Ntawm qhov sib npaug, qhov sib npaug ntawm H + thiab OH- ions yuav sib xyaw ua H2O, ua rau pH ntawm 7.0 (tsis nruab nrab). Lub pH ntawm qhov sib npaug ntawm qhov sib npaug ntawm qhov titration yuav ib txwm yog 7.0, nco ntsoov tias qhov no tsuas yog muaj tseeb rau titration ntawm cov kua qaub muaj zog nrog lub hauv paus muaj zog
Yuav ua li cas koj pom cov hauv paus hniav ntawm ib qho kev sib npaug algebraically?
Cov hauv paus hniav ntawm ib qho kev sib npaug plaub yog muab los ntawm: x = [-b +/- sqrt(-b^2 - 4ac)]/2a. Sau lub quadratic nyob rau hauv daim ntawv ntawm ax^2 + bx + c = 0. Yog hais tias qhov sib npaug yog nyob rau hauv daim ntawv y = ax^2 + bx + c, tsuas yog hloov lub y nrog 0. Qhov no yog ua li cas vim lub hauv paus ntawm lub equation yog cov nqi uas qhov y axis sib npaug rau 0