Tus Naj Npawb vs Prime Factors
Lub tswvyim 'factorization' yog txhais ntawm cov lej. Yog li ntawd, qhov tseem ceeb ntawm tus lej (tus lej) yog lwm tus lej uas tuaj yeem faib tus thawj rau hauv tus lej thib peb yam tsis muaj kev ceeb toom. Cov xwm txheej rau tus lej suav nrog 1 thiab tus lej nws tus kheej. Piv txwv li, yam ntawm 8 yog 1, -1, 2, -2, 4, -4, 8 thiab -8.
Tus lej
Tus lej tseem ceeb yog tus lej ntuj ntau dua ib qho, uas tsuas yog faib los ntawm ib tus thiab tus lej xwb. Yog li ntawd, ib tug prime muaj tsuas yog ob yam, ib tug thiab tus lej nws tus kheej. Piv txwv li, 5 yog tus lej tseem ceeb vim nws tsuas yog faib los ntawm ib tus thiab tus lej xwb. Cov lej zoo uas muaj ntau tshaj ob yam yog hu ua cov lej sib xyaw. Yim yog tus lej sib xyaw vim nws muaj ntau tshaj ob yam. Tsis muaj cov qauv los tsim cov lej tseem ceeb. Txhawm rau tsim kom muaj tus lej ua tus thawj, peb yuav tsum ua kom pom tias nws tsis muaj lwm yam tshaj li 1 thiab tus lej nws tus kheej los ntawm kev siv lej ntawm kev faib thiab cov peev txheej.
Prime Factors
Txhua tus lej muaj tsawg kawg yog ob yam. Tawm ntawm cov xwm txheej no, qee qhov tuaj yeem yog tus lej tseem ceeb. Cov no yog hu ua prime factor. Hauv lwm lo lus, qhov tseem ceeb ntawm tus lej yog qhov tseem ceeb ntawm tus lej ntawd thiab tseem yog tus lej tseem ceeb. Yog li 2 yog qhov tseem ceeb ntawm 8. Txawm li cas los xij, lwm yam ntawm 8 tsis yog qhov tseem ceeb, 4 tsis yog qhov tseem ceeb ntawm 8, vim 4 yog tus lej sib xyaw.
Cov txheej txheem ntawm kev nthuav qhia tus lej tag nrho raws li cov khoom lag luam tseem ceeb yog hu ua prime factorization. Ua ntej, nws yuav sim xyuas cov yam ntxwv ntawm 2 hauv tus lej, thiab tshem tawm ntau li ntau tau. Tom qab ntawd sim cov prime 3 tom ntej thiab tshem tawm ntau yam ntawm 3 li sai tau. Rov ua cov txheej txheem kom txog thaum tus lej tau nthuav tawm raws li cov khoom lag luam ntawm tus lej tseem ceeb.
Piv txwv li, cia peb nrhiav qhov tseem ceeb ntawm 840.
840 muaj qhov tseem ceeb ntawm 2
840=2 × 420
420 muaj qhov tseem ceeb ntawm 2
840=2 × 2 × 210
210 muaj qhov tseem ceeb ntawm 2
840=2 × 2 × 2 × 105
105 tsis muaj qhov tseem ceeb ntawm 2. Vim 105 yog faib los ntawm 3, 3 yog qhov tseem ceeb ntawm 105.
840=2 × 2 × 2 × 3 × 35
35 tsis muaj qhov tseem ceeb ntawm 2 lossis 3. Tab sis, txij li 35 yog faib los ntawm 5, 5 yog qhov tseem ceeb ntawm 35.
840=2 × 2 × 2 × 3 × 5 × 7
7 yog tus lej tseem ceeb. Yog li, 840 tuaj yeem sau ua cov khoom lag luam tseem ceeb raws li hauv qab no.
840=2 × 2 × 2 × 3 × 5 × 7
Thaum peb tshem tawm cov ntsiab lus tseem ceeb, tus lej uas peb yuav tsum tau tsom mus ntxiv yog ib txwm me dua.
Qhov txawv ntawm Tus Naj Npawb thiab Tus Kheej Tseem Ceeb yog dab tsi?
¤ Tus lej tseem ceeb tsuas muaj ob yam, ib qho thiab tus lej nws tus kheej.
¤ Ib qho tseem ceeb ntawm tus lej yog qhov tseem ceeb thiab tseem yog tus lej tseem ceeb.
