Koj ua li cas ntxoov ntxoo thaj tsam ntawm kev tsis sib xws?

2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2024-01-18 08:15

Muaj peb kauj ruam:

1. Rearrange qhov sib npaug kom "y" nyob rau sab laug thiab txhua yam nyob rau sab xis.
2. Teem lub "y = kab" (ua rau nws yog ib txoj kab ruaj khov rau y≤ lossis y≥, thiab ib kab dashed rau y)
3. Duab ntxoov ntxoo saum kab rau "ntau dua" (y> lossis y≥) lossis hauv qab kab rau "tsawg dua" (y< lossis y≤).

Ntawm no, koj ua li cas ntxoov cov cheeb tsam uas tsis xav tau?

Los ntawm ntxoov ntxoo tus thaj tsam tsis xav tau , show cov cheeb tsam txhais los ntawm cov txheej txheem ntawm qhov tsis sib xws y < 2x + 5, y ≧ x, thiab x < 4. Kev daws: Kos cov kab rau txhua qhov tsis sib xws thiab ntxoov ntxoo tus tsis xav tau cheeb tsam rau txhua tus ntawm lawv.

Ib yam li ntawd, koj yuav daws qhov system ntawm kev sib npaug li cas? Nov yog qhov nws mus:

1. Kauj Ruam 1: Daws ib qho kev sib npaug rau ib qho ntawm qhov sib txawv. Cia peb daws thawj qhov sib npaug rau y:
2. Kauj Ruam 2: Hloov qhov sib npaug mus rau lwm qhov sib npaug, thiab daws rau x.
3. Kauj Ruam 3: Hloov x = 4 x = 4 x = 4 rau hauv ib qho ntawm qhov sib npaug qub, thiab daws rau y.

Ib yam li ntawd, koj yuav pom qhov tsis sib xws li cas?

Peb feem ntau tuaj yeem daws qhov tsis sib xws los ntawm kev ntxiv (lossis rho tawm) tus lej ntawm ob sab (ib yam li hauv Kev Taw Qhia rau Algebra), zoo li qhov no:

1. daws: x + 3 < 7. Yog tias peb rho 3 los ntawm ob sab, peb tau txais:
2. daws: 3y < 15. Yog tias peb faib ob sab los ntawm 3 peb tau txais:
3. Txawb: −2y < −8.
4. daws: bx <3b.

Qhov tsis sib xws yog dab tsi?

Ib kev tsis sib xws piv ob qhov tseem ceeb, qhia tias ib qho tsawg dua, ntau dua, lossis tsuas yog tsis sib npaug rau lwm tus nqi. a ≠ b hais tias a tsis sib npaug b. ib b hais tias a yog ntau dua b. (ob qho no yog hu ua kev tsis sib xws nruj )