2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Ib nrab derivatives thiab txuas ntxiv. Yog txoj haujlwm f: R → R yog diifierentiable, ces f yog txuas ntxiv. cov derivatives ib nrab ntawm ib txoj haujlwm f: R2 → R. f: R2 → R xws li fx(x0, y0) thiab fy(x0, y0) tab sis f tsis tas li ntawm (x0, y0).
Yuav ua li cas koj thiaj paub yog tias ib feem derivative txuas ntxiv?
Let (a, b)∈R2. Tom qab ntawd, kuv paub tias ib nrab derivatives muaj thiab fx(a, b)=2a + b, thiab fy(a, b)=a + 2b. Txhawm rau ntsuas qhov txuas ntxiv, lim(x, y) →(a, b)fx(x, y)=lim(x, y) →(a, b) 2x + y=2a + b=fx(a, b).
Dab tsi yog ib feem derivatives?
1.1.
V (x)=(x 1 + x 2) 2 Rau tag nrho cov Cheebtsam ntawm ib vector x, muaj ib qho kev sib txuas tsis tu ncua V(x); thaum x=0, V(0)=0 tab sis tsis yog rau x ≠ 0, peb muaj V(x) > 0, piv txwv li, thaum x1=−x 2, peb muaj V(x)=0, yog li V(x) tsis zoo meej muaj nuj nqi thiab yog semipositive definite function.
Puas yog qhov sib txawv ntawm ib feem cuam tshuam txuas ntxiv?
Ib kab hauv qab: muaj ib feem derivatives yog qhov tsis muaj zog zoo nkaujvim nws tsis tau lees paub txuas ntxiv! Kev sib txawv (muaj nyob ntawm qhov kwv yees zoo linear) yog qhov muaj zog ntau dua.
Puas sib txawv txhais tau tias muaj ib feem ntawm cov khoom siv?
Qhov sib txawv theorem hais tias txuas ntxiv ib feem derivatives txaus rau ib txoj haujlwm kom sib txawv. …Kev sib tham ntawm qhov sib txawv theorem tsis muaj tseeb. Nws yog qhov ua tau rau qhov kev ua haujlwm sib txawv kom muaj cov khoom siv tsis tu ncua.
Pom zoo:
Puas yog ib feem ntawm sab laug ventricular ejection feem?
Nco lub siab. Ib txwm tshuav ventricular ejection feem (LVEF) yog li ntawm 55% txog 70%. Ib qho LVEF ntawm 65%, piv txwv li txhais tau hais tias 65% ntawm tag nrho cov ntshav nyob rau hauv sab laug ventricle yog nqus tawm nrog txhua lub plawv dhia.
Thaum cov kab mob nkag mus rau ntawm daim tawv nqaij lawv feem ntau?
Cov kab mob uas muaj peev xwm ua rau cov kab mob-cov kab mob-feem ntau nkag mus rau peb lub cev dhau ntawm lub qhov ncauj, qhov muag, qhov ntswg, lossis qhov qhib urogenital, lossis dhau ntawm qhov txhab lossis tom ua txhaum ntawm daim tawv nqaij.
Dab tsi yog ob feem peb raws li feem pua?
Hloov 2/3 rau ib xees. Yog li ntawd, txoj kev daws yog 66%. Ob feem peb ntawm 100 yog dab tsi? Yog li, ob feem peb ntawm 100 yog kwv yees 66.7. 2/3 yog ib feem ntawm 100 yog dab tsi? Thaum peb siv feem pua, qhov peb hais tiag tiag yog qhov feem pua yog feem pua ntawm 100.
Thaum hloov mus ua niam txiv feem coob ntawm cov niam txiv?
Thaum hloov mus ua niam txiv feem ntau ntawm cov niam txiv: kev sib raug zoo ntau dua. ua kev zoo siab rau ib leeg. ua siab ntev rau ib leeg. kev sib raug zoo ntawm nkawm niam txiv cuam tshuam li cas? Txoj kev hloov mus rau kev ua niam txiv yog lub sijhawm puas siab puas ntsws hauv cov niam txiv lub neej.
Thaum twg yog qhov khoom mus tas li txhim kho piaget?
Raws li Piaget cov theem ntawm txoj kev loj hlob, cov khoom mus tas li yog lub hom phiaj tseem ceeb rau theem sensorimotor. Txawm li cas los xij, kev tshawb fawb tsis ntev los no qhia tau tias cov menyuam mos pib nkag siab txog yam khoom mus tas li nruab nrab hnub nyoog plaub thiab xya lub hlis.
