Qhov ntxoov ntxoo ntawm daim duab txhais li cas?
Qhov ntxoov ntxoo ntawm daim duab txhais li cas?

Video: Qhov ntxoov ntxoo ntawm daim duab txhais li cas?

Video: Qhov ntxoov ntxoo ntawm daim duab txhais li cas?
Video: qhov ncauj qhia tau neeg Tus YAM NTXWV thiab TXOJ HMOO 2024, Kaum ib hlis
Anonim

Cov duab tsis sib xws. Rau daim duab kev tsis sib xws, kho tus, lossis ≧ kos npe raws li tus = kos npe, thiab daim duab qhov sib npaug. Yog qhov tsis sib xws, daim duab qhov sib npaug li ib kab dotted. Yog nws ua tsis txaus siab rau qhov tsis sib xws, ntxoov ntxoo thaj av uas ua tsis muaj qhov point.

Dhau li ntawm no, qhov ntxoov ntxoo ntawm ib daim duab txhais li cas?

Graphing Linear Inequalities. Qhov no yog ib daim duab Qhov tsis sib xws y ≦ x + 2. Koj tuaj yeem pom y = x + 2 kab, thiab thaj chaw ntxoov ntxoo yog qhov twg y tsawg dua los yog sib npaug rau x + 2.

Ib yam li ntawd, vim li cas peb thiaj li ntxoov ntxoo thaum ntsuas qhov tsis sib xws? Peb yuav ntxoov ntxoo thaj tsam hauv qab ntawm txoj kab ciam teb vim peb muaj qhov "tsawg dua" tom qab peb hloov qhov qub kev tsis sib xws teeb meem rau hauv daim ntawv uas yog cov y yog ntawm sab laug. Peb ua tau txheeb xyuas yog tias peb muaj daim duab nws kom raug los ntawm kev xaiv cov ntsiab lus kuaj pom nyob rau hauv ntxoov ntxoo cheeb tsam.

Ntawm no, lub npe ntawm thaj chaw ntxoov ntxoo hauv daim duab yog dab tsi?

Cov ntxoov ntxoo thaj tsam yog hu ua txoj kev cia siab cheeb tsam , thiab txhua lub ntsiab lus hauv qhov no cheeb tsam txaus siab qhov tsis sib xws x ≧ -2. Daim ntawv ceeb toom kuj hais tias kab sawv cev rau cheeb tsam ciam teb yog ib txoj kab ruaj khov; qhov no txhais tau hais tias qhov tseem ceeb ntawm kab x = -2 suav nrog hauv cov kev daws teeb meem rau qhov tsis sib xws.

Yuav ua li cas koj phim qhov tsis sib xws nrog daim duab?

Cov duab tsis sib xws . Rau daim duab ib kev tsis sib xws , kho tus, lossis ≧ kos npe ua tus = kos npe, thiab daim duab qhov sib npaug. Yog tias kev tsis sib xws yog, daim duab qhov sib npaug li ib kab dotted. Yog tias kev tsis sib xws yog ≦ lossis ≧, daim duab qhov sib npaug ua ib txoj kab ruaj khov.

Pom zoo: