Cov txheej txheem:
Video: Koj puas siv cov hlua khi kom nce thiab txo qis?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov lub sijhawm sau ntawv yuav zoo li no: (-∞, 2) u (2, ∞). Ib txwm siv kab lus, tsis yog a bracket , nrog infinity los yog tsis zoo infinity. Koj kuj siv cov kab lus rau 2 vim ntawm 2, daim duab tsis yog nce los yog txo - nws yog kiag li tiaj tus.
Hais txog qhov no, dab tsi ncua sij hawm yuav tsum tau siv los sawv cev ntawm qhov nce thiab txo qis?
Thaum piav txog qhov twg ua haujlwm yog nce , siv qhib interval notation ntawm x qhov tseem ceeb (domain qhov tseem ceeb, sab laug mus rau sab xis). Thaum piav txog qhov twg ua haujlwm yog txo , siv qhib interval notation ntawm x qhov tseem ceeb (domain qhov tseem ceeb, sab laug mus rau sab xis). cov x qhov tseem ceeb tau loj dua, qhov y qhov tseem ceeb (function values) tau me dua.
Tsis tas li ntawd, dab tsi yog qhov nce ntxiv? Peb hais tias muaj nuj nqi nce on ib lub sijhawm yog tias muaj nuj nqis ua haujlwm nce raws li tus nqi nkag nce hauv qhov ntawd lub sijhawm . Ib yam li ntawd, ib qho kev ua haujlwm tau txo qis ntawm ib qho lub sijhawm yog hais tias cov nuj nqis muaj nuj nqi txo raws li cov input nqi nce dhau ntawd lub sijhawm.
Ntxiv mus, ua li cas koj thiaj paub thaum twg yuav siv cov kab lus lossis cov hlua khi hauv qhov tsis sib xws?
Kev piav qhia: Siv ib bracket (qee zaus hu ua square bracket ) los qhia tias qhov kawg suav nrog hauv lub sijhawm, a kab lus (qee zaus hu ua ib puag ncig bracket ) los qhia tias tsis yog. kab lus zoo li nruj kev tsis sib xws . (3, 7) suav nrog 3.1 thiab 3.007 thiab 3.00000000002, tab sis nws tsis suav nrog 3.
Yuav ua li cas koj nrhiav tau ib lub caij?
Xaus
- Ib qho Interval yog txhua tus lej ntawm ob tus lej muab.
- Qhia tias tus lej pib thiab qhov kawg suav nrog yog qhov tseem ceeb.
- Muaj peb txoj hauv kev tseem ceeb los qhia txog qhov sib txawv: Kev tsis sib xws, Tus lej Kab thiab Daim Ntawv Qhia Txog ntu.
Pom zoo:
Yuav ua li cas koj thiaj nrhiav tau lub caij nyoog nce thiab txo?
Cov derivative ntawm ib qho kev ua haujlwm yuav raug siv los txiav txim seb qhov kev ua haujlwm yog nce lossis txo qis ntawm ib ntus hauv nws qhov chaw. Yog tias f '(x) > 0 ntawm txhua qhov taw tes hauv lub caij nyoog I, ces qhov kev ua haujlwm tau hais tias yuav nce ntawm I. f'(x) < 0 ntawm txhua qhov taw tes hauv lub sijhawm kuv, ces qhov ua haujlwm tau hais tias yuav txo qis. ntawm kuv
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