Cov txheej txheem:
Video: Koj yuav sau ib kab kab li cas?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Kab ntu feem ntau hu ua ob txoj hauv kev:
- Los ntawm cov ntsiab lus kawg. Hauv daim duab saum toj no, lub kab ntu yuav hu ua PQ vim nws txuas ob lub ntsiab lus P thiab Q. Nco qab tias cov ntsiab lus feem ntau yog sau nrog ib tus tsiaj ntawv loj (caij dav hlau).
- Los ntawm ib tsab ntawv. Cov ntu saum toj no tsuas yog hu ua "y".
Kuj paub yog, ua li cas koj sau ib lub teeb?
Rays feem ntau muaj npe nyob rau hauv ob txoj kev:
- Los ntawm ob lub ntsiab lus. Hauv daim duab saum toj kawg nkaus ntawm nplooj ntawv, txoj kab hluav taws xob yuav raug hu ua AB vim pib ntawm point A thiab hla B ntawm nws txoj kev mus rau infinity.
- Los ntawm ib tsab ntawv. Cov kab hluav taws xob saum toj no tsuas yog hu ua "q".
Kuj Paub, ob txoj hauv kev rau npe kab yog dab tsi? Lub npe kab A kab raug txheeb xyuas thaum koj npe dy cov ntsiab lus ntawm kab thiab kos a kab tshaj cov ntawv. A kab yog ib txheej ntawm cov ntsiab lus txuas mus ntxiv uas txuas ntxiv mus tsis kawg nyob rau hauv ib qho ntawm nws cov kev taw qhia. Kab tseem muaj npe nrog cov tsiaj ntawv me lossis ib tsab ntawv me me.
Ib yam li ntawd, tej zaum koj yuav nug, lub cim rau kab yog dab tsi?
Cov lus ntawm cov cim hauv geometry:
| Cim | Cim npe | Lub ntsiab lus / txhais |
|---|---|---|
| arc | arc ntawm point A rau point B | |
| ⊥ | perpendicular | kab perpendicular (90 ° kaum) |
| ∥ | thaum uas tig mus | kab sib npaug |
| ≅ | sib tham | sib npaug ntawm cov duab geometric thiab qhov loj me |
Lub cim rau perpendicular yog dab tsi?
Ob kab uas sib tshuam thiab tsim cov kaum sab xis yog hu ua perpendicular kab. Cov cim ⊥ yog siv los qhia perpendicular kab. Hauv daim duab, kab l ⊥ kab m.
Pom zoo:
Yuav ua li cas koj nrhiav tau qhov sib npaug ntawm ib kab uas muab ib tug point thiab ib tug parallel kab?
Qhov sib npaug ntawm kab hauv daim ntawv nqes hav-intercept yog y = 2x + 5. Qhov nqes hav ntawm parallelline yog tib yam: m = 2. Yog li, qhov sib npaug ntawm kab sib npaug yog y = 2x + a. Txhawm rau nrhiav ib qho, peb siv qhov tseeb tias kab yuav tsum dhau los ntawm qhov muab: 5 = (2) ⋅ (− 3) + a
Yuav ua li cas koj ntim kab rau kab chromatography?
Packing a (silica gel) kem: Siv ib daim hlau los ntxiv ib lub paj rwb rau hauv qab ntawm kem. Clamp lub kem mus rau ib lub nplhaib sawv ntsug thiab ntxiv cov xuab zeb txaus kom sau qhov nkhaus ntawm kab. Muab ib tug pinch clamp rau ntawm lub raj, ces sau rau sab 1/4 mus rau 1/3 tag nrho nrog rau qhov intial eluent
Yuav ua li cas koj sau txoj kab nqes nqes intercept daim ntawv nyob rau hauv tus qauv daim ntawv?
Standard form yog lwm txoj hauv kev los sau daim ntawv nqes hav-intercept (as opposed to y=mx+b). Nws sau li Ax+By=C. Koj tuaj yeem hloov daim ntawv nqes hav-intercept rau cov qauv zoo li no: Y=-3/2x + 3. Tom ntej no, koj cais qhov y-intercept (qhov no nws yog 2) zoo li no: Ntxiv 3/2x rau txhua sab ntawm kab zauv kom tau qhov no: 3/2x + y = 3
Yuav ua li cas muaj pes tsawg tus tooj liab atoms koj yuav tsum tau kab ntawm ib sab los tsim ib kab 1'm ntev?
Los ntawm kev sib piv, lub ntiaj teb cov pej xeem tsuas yog hais txog 7? 109 neeg. Yog tias koj tuaj yeem ua kab 100,000,000 tooj liab atoms ib sab, lawv yuav tsim ib txoj kab ntev li 1 cm
Yuav ua li cas koj sau ib qho kev sib npaug nyob rau hauv txoj kab nqes intercept daim ntawv rau ib lub rooj?
Siv qhov sib npaug y = mx + b thiab ntsaws rau hauv tus nqi m (m = 1) thiab ib khub ntawm (x, y) kev tswj hwm ntawm lub rooj, xws li (5, 3). Ces daws rau b. Thaum kawg, siv qhov m thiab b qhov tseem ceeb koj pom (m = 1 thiab b = -2) los sau cov kab zauv