Video: Yuav ua li cas koj nrhiav tau lub sij hawm tom ntej nyob rau hauv ib tug quadratic sequence?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Sau tus nth lub sij hawm ntawm no plaub fab tus lej ib ntus . Kauj ruam 1: Paub meej tias cov ib ntus yog plaub fab . Qhov no yog ua los ntawm kev nrhiav qhov sib txawv thib ob. Kauj Ruam 2: Yog tias koj faib qhov sib txawv thib ob los ntawm 2, koj yuav tau txais tus nqi ntawm a.
Ib yam li ntawd, tus qauv rau kev nrhiav lub nth lub sij hawm nyob rau hauv ib theem zuj zus yog dab tsi?
Xws li ua ntu zus tuaj yeem hais qhia nyob rau hauv cov nqe lus ntawm ntu term ntawm ib ntus . Hauv qhov no, lub ntu term = 2 n. Rau nrhiav qhov 1 lub sij hawm , muab n = 1 rau hauv qauv , ua nrhiav ntu 4 lub sij hawm , hloov tus n's los ntawm 4's: 4th lub sij hawm = 2 × 4 = 8.
Tsis tas li ntawd, koj ua li cas thiaj nrhiav tau lub quadratic sequence? Nyob rau hauv quadratic sequences
- Thawj lub sij hawm yog a × 1 2 + b × 1 + c = a + b + c.
- Lub sij hawm thib ob yog a × 2 2 + b × 2 + c = 4 a + 2 b + c.
- Lub sij hawm thib peb yog a × 3 2 + b × 3 + c = 9 a + 3 b + c.
Kuj Paub, lub sij hawm nth ntawm ib ntu yog dab tsi?
Cov ' nth ' lub sij hawm yog ib tug formula nrog 'n' nyob rau hauv nws uas enables koj mus nrhiav tau tej lub sij hawm ntawm ib ntus tsis tas yuav nce ntawm ib qho lub sij hawm mus rau tom ntej. 'n' stands rau lub lub sij hawm tus lej thiaj li nrhiav tau 50th lub sij hawm peb yuav cia li hloov 50 nyob rau hauv cov mis nyob rau hauv qhov chaw ntawm 'n'.
Dab tsi yog quadratic equation hauv lej?
A quadratic equation yog ib kev sib npaug ntawm qhov thib ob degree, txhais tau tias nws muaj tsawg kawg yog ib lub sij hawm uas yog squared. Cov qauv qauv yog ax² + bx + c = 0 nrog a, b, thiab c ua qhov tsis tu ncua, lossis cov lej coefficients, thiab x yog qhov tsis paub sib txawv.
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