Kev faib ib feem los ntawm ib feem yuav zoo li tsis meej pem thaum xub thawj, tab sis nws yog qhov yooj yim tiag tiag. Txhua yam koj yuav tsum ua yog ntxeev, sib npaug thiab ua kom yooj yim! Kab lus no yuav taug kev koj los ntawm cov txheej txheem thiab qhia koj tias nws yooj yim npaum li cas los faib ib feem ntawm ib feem.
Kauj ruam
Ntu 1 ntawm 2: Nkag Siab Yuav Ua Li Cas Thiaj Li Hloov Fractions by Fractions
Kauj Ruam 1. Xav txog tias kev faib ua feem faib txhais tau li cas
Txog 2 ÷ 1/2 nug Ada: "Muaj pes tsawg ib nrab nyob hauv 2?" Cov lus teb yog 4 vim tias txhua chav (1) muaj ob “ib nrab”, thiab muaj 2 chav nyob tag nrho: 2 “ib nrab”/1 chav * 2 chav = 4 “ib nrab”.
- Sim xav txog qhov sib npaug tib yam siv ib khob dej: Muaj pes tsawg thiab ib nrab khob dej nyob hauv 2 khob dej? Koj tuaj yeem hliv 2 thiab ib nrab khob dej rau hauv txhua khob dej. Qhov ntawd txhais tau tias, qhov tseeb, koj ntxiv cov iav "ib nrab", thiab koj muaj ob lub khob: 2 "ib nrab"/1 khob * 2 khob = 4 "ib nrab".
- Qhov no txhais tau tias yog qhov feem koj faib yog 0 thiab 1, cov lus teb ib txwm loj dua tus lej qub! Qhov no muaj tseeb thaum koj faib tus lej lossis feem ntawm ib feem.
Kauj Ruam 2. Nkag siab tias kev faib faib yog qhov sib txawv ntawm kev sib npaug
Yog li, kev faib los ntawm ib feem tuaj yeem daws tau los ntawm kev sib npaug los ntawm qhov sib txawv ntawm cov feem. Qhov sib txig sib luag ntawm ib feem (tseem hu ua "sib npaug sib npaug") yog cov feem uas tau rov qab los, yog li tus lej thiab cov lej sib pauv chaw. Hauv ib pliag, peb yuav faib cov feem faib los ntawm cov zauv, los ntawm kev nrhiav qhov sib thooj ntawm cov feem thib ob thiab muab ob qho zauv faib ua feem. Txawm li cas los xij, cia saib qee qhov kev tawm tsam ua ntej:
- Qhov sib txawv ntawm 3/4 yog 4/3.
- Qhov txawv ntawm 7/5 yog 5/7.
- Qhov sib txawv ntawm 1/2 yog 2/1 lossis 2.
Kauj Ruam 3. Nco qab cov kauj ruam hauv qab no kom faib ib feem ntawm ib feem
Hauv kev txiav txim, cov theem suav nrog:
- Tsuas yog tso thawj feem ntawm qhov kev ua zauv.
- Hloov cov cim faib rau cov lej sib npaug.
- Hloov qhov feem thib ob (nrhiav nws sib nrug).
- Muab tus zauv sib faib (tus lej saum toj) ntawm ob feem ua ke. Cov txiaj ntsig sib npaug yog tus lej (sab saum toj) ntawm koj cov lus teb.
- Muab tus zauv sib faib (tus lej hauv qab) ntawm ob feem ua ke. Cov khoom lag luam ntawm cov khoom lag luam yog tus lej ntawm koj cov lus teb.
- Ua kom yooj yim rau koj cov zauv los ntawm kev ua kom yooj yim rau lawv cov lus yooj yim.
Kauj Ruam 4. Ua cov kauj ruam no rau qhov piv txwv 1/3 2/5
Peb yuav pib los ntawm kev tawm thawj feem me me, thiab hloov cov cim faib rau cov cim sib npaug:
- 1/3 ÷ 2/5 = Ua:
- 1/3 * _ =
- Tam sim no, peb thim rov qab qhov feem thib ob (2/5) kom pom nws qhov sib txawv, uas yog 5/2:
- 1/3 * 5/2 =
- Tam sim no, suav tus lej (tus lej sab saum toj) ntawm ob feem, 1*5 = 5.
- 1/3 * 5/2 = 5/
- Tam sim no, muab cov lej sib faib (tus lej hauv qab) ntawm ob feem, 3*2 = 6.
- Tam sim no, peb muaj: 1/3 * 5/2 = 5/6
- Cov feem no tsis tuaj yeem yooj yim ntxiv, yog li peb muaj peb cov lus teb.
Kauj Ruam 5. Sim nco qab cov lus sib dhos hauv qab no kom pab koj nco qab:
"Kev faib cov feem yog ib qho yooj yim, thim rov qab ob feem, tom qab ntawd sib npaug. Tsis txhob hnov qab ua kom yooj yim, ua ntej nws yog lub sijhawm noj."
Lwm qhov kev ceeb toom pab qhia koj yuav ua li cas nrog txhua feem ntawm qhov kev ua zauv: "Cia Kuv (thawj feem), Hloov Kuv (faib cim), Hloov Kuv (ob feem me me)."
Ntu 2 ntawm 2: Sib faib Fractions los ntawm Fractions hauv Teeb Meem
Kauj Ruam 1. Pib nrog cov lus nug piv txwv
Cia siv 2/3 ÷ 3/7. Cov lus nug no nug tus lej ntawm ntu sib npaug 3/7, uas tuaj yeem pom hauv tus nqi 2/3. Tsis txhob txhawj. Nws tsis nyuaj li nws lub suab!
Kauj Ruam 2. Hloov daim paib faib rau cov cim sib npaug
Koj qhov sib npaug tshiab yuav yog: 2/3 * _ (Peb yuav sau daim ntawv no ib pliag.)
Kauj Ruam 3. Tam sim no, nrhiav qhov sib thooj ntawm qhov feem thib ob
Qhov no txhais tau tias ntxeev 3/7 kom tus lej (3) tam sim no nyob hauv qab, thiab tus lej (7) yog tam sim no nyob rau saum. Qhov sib txawv ntawm 3/7 yog 7/3. Tam sim no, sau koj qhov kev ua zauv tshiab:
2/3 * 7/3 = _
Kauj Ruam 4. Muab koj feem zauv faib
Ua ntej, muab cov zauv lej ntawm ob feem faib: 2 * 7 = 14. 14 yog tus lej (tus lej saum toj) ntawm koj cov lus teb. Tom qab ntawd, muab cov lej faib ua ob feem: 3 * 3 = 9. 9 yog tus lej (tus lej hauv qab) ntawm koj cov lus teb. Tam sim no, koj paub tias 2/3 * 7/3 = 14/9.
Kauj Ruam 5. Ua kom yooj yim rau koj feem
Hauv qhov teeb meem no, vim tias tus lej ntawm cov feem feem ntau dua tus lej, peb paub tias peb feem feem ntau dua 1. Peb yuav tsum hloov nws mus rau tus lej sib xyaw. (Tus lej sib xyaw yog tus lej tag nrho thiab ib feem ua ke, piv txwv li 1 2/3.)
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Ua ntej tshaj, faib tus lej
Kauj ruam 14. nrog 9.
Tus lej 14 faib los ntawm 9 sib npaug ib qho nrog cov seem ntawm 5, yog li koj yuav tsum sau koj cov lus yooj yooj yim li: 1 5/9 ("Ib tsib-nineth").
- Nres, koj tau pom cov lus teb! Koj tuaj yeem hais qhia tias koj tsis tuaj yeem yooj yim rau feem ntxiv vim tias qhov sib faib tsis tuaj yeem faib los ntawm tus lej (9 tsis tuaj yeem faib ua 5) thiab tus lej yog tus lej tseem ceeb, lossis tus lej uas tsuas yog faib los ntawm ib tus lej xwb.
Kauj Ruam 6. Sim lwm qhov piv txwv
Cia peb sim lo lus nug 4/5 ÷ 2/6 =. Ua ntej tshaj, hloov daim paib faib rau cov cim sib npaug (4/5 * _ =), tom qab ntawd pom qhov sib txawv ntawm 2/6, uas yog 6/2. Tam sim no, koj muaj qhov sib npaug: 4/5 * 6/2 =_. Tam sim no, muab tus zauv sib faib, 4 * 6 = 24, thiab tus denominator 5* 2 = 10. Tam sim no, koj muaj 4/5 * 6/2 = 24/10.
Tam sim no, yooj yim feem. Txij li cov lej suav ntau dua tus lej, peb yuav tsum hloov pauv qhov no mus rau tus lej sib xyaw.
- Ua ntej, faib cov zauv los ntawm tus lej, (24/10 = 2 tshuav 4).
- Sau cov lus teb raws li 2 4/10. Peb tseem tuaj yeem ua kom yooj yim qhov feem no ntxiv!
- Nco ntsoov tias 4 thiab 10 yog tus lej. Yog li, thawj kauj ruam kom yooj yim nws yog faib txhua tus lej los ntawm 2. Peb tau txais 2/5.
- Txij li cov lej (5) tsis tuaj yeem faib los ntawm tus lej (2) thiab 5 yog tus lej tseem ceeb, peb paub tias qhov feem no tsis tuaj yeem yooj yim ntxiv. Yog li, peb cov lus teb yog: 2 2/5.
Kauj Ruam 7. Tau txais kev pab txuas ntxiv ua kom yooj yim dua
Tej zaum koj tau siv sijhawm ntau los kawm yuav ua li cas thiaj yooj yim ua ntu zus ua ntej yuav faib lawv ib leeg. Txawm li cas los xij, yog tias koj xav tau kev kho dua tshiab lossis qee qhov kev pabcuam, muaj qee cov ntawv zoo hauv online uas tuaj yeem pab tau zoo rau koj.
Yam ntsig txog wikiHow Kab Lus
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