4 Txoj Hauv Kev Los Lej Feem Xeem

Cov txheej txheem:

4 Txoj Hauv Kev Los Lej Feem Xeem
4 Txoj Hauv Kev Los Lej Feem Xeem

Video: 4 Txoj Hauv Kev Los Lej Feem Xeem

Video: 4 Txoj Hauv Kev Los Lej Feem Xeem
Video: Tshuaj theem vim li cas thiaj tau nqi ?/ Siv kho mob dab tsi?/paris polyphylla use for? 2024, Kaum ib hlis
Anonim

Suav suav feem yog ib qho txuj ci siv lej zoo tshaj los txhim kho. Ua ntej ua qhov kev suav zauv, kawm paub yuav txheeb xyuas qhov twg thiab hom twg ntawm kev faib ua feem. Tom qab ntawd, koj tuaj yeem ntxiv lossis rho tawm lawv. Rau kev suav daws nyuaj dua, kawm paub yuav ua li cas muab faib thiab faib ua feem. Feem ntau, koj yuav tsum tau ua kom yooj yim lossis txo qis.

Kauj ruam

Txoj Kev 1 ntawm 4: Paub txog Fractions

Xeem Fractions Kauj Ruam 1
Xeem Fractions Kauj Ruam 1

Kauj Ruam 1. Nrhiav cov feem

Fractions tau sau ua ib tus lej saum toj kab sib faib, thiab lwm tus lej hauv qab kab.

Xeem Fractions Kauj Ruam 2
Xeem Fractions Kauj Ruam 2

Kauj Ruam 2. Txheeb tus lej

Tus lej saum toj kab tau hu ua tus lej thiab qhia tias muaj pes tsawg qhov nyob hauv qhov feem.

Piv txwv li, hauv qhov feem 1/5, “1” yog tus lej

Xeem Fractions Kauj Ruam 3
Xeem Fractions Kauj Ruam 3

Kauj Ruam 3. Nrhiav tus lej sib cais

Tus nab npawb tso rau hauv qab kab no hu ua denominator. Tus nqi no qhia txog tus lej ntawm ntu uas "tsim" ib qho lej.

Piv txwv li, hauv qhov feem 1/5, "5" yog qhov sib faib yog li muaj tsib ntu rau feem

Xeem Fractions Kauj Ruam 4
Xeem Fractions Kauj Ruam 4

Kauj Ruam 4. Txiav txim siab seb puas yog cov feem uas tsim nyog los yog cov feem tsis raug

Yog tias tus lej me dua tus lej, qhov feem yog ib feem ntawm ntuj. Hauv kev faib ua feem tsis raug, tus lej yog ntau dua tus lej.

  • Piv txwv, 3/4 yog ib feem uas tsim nyog thiab 5/3 yog ib feem tsis raug.
  • Yog tias koj muaj cov lej uas suav nrog ib feem, tus lej paub tias yog tus lej sib xyaw. Piv txwv, 1 1/2 yog tus lej sib xyaw.

Txoj Kev 2 ntawm 4: Ntxiv lossis Rho Tawm Tshooj

Xeem Fractions Kauj Ruam 5
Xeem Fractions Kauj Ruam 5

Kauj Ruam 1. Txheeb cais feem nrog tib tus lej

Yog tias koj xav tau ntxiv lossis rho tawm feem, txhua feem yuav tsum muaj tus lej sib npaug ua ntej koj ua qhov kev suav. Saib xyuas tus lej ntawm txhua feem kom paub tseeb tias lawv txhua tus sib npaug (zoo ib yam).

Xeem Fractions Kauj Ruam 6
Xeem Fractions Kauj Ruam 6

Kauj Ruam 2. Nrhiav ib feem sib faib yog tias txhua feem muaj qhov sib txawv sib txawv

Yog tias cov lej sib npaug tsis zoo ib yam, koj yuav tsum tau hloov cov lej faib kom muaj cov lej sib npaug. Txhawm rau nrhiav cov lej sib faib, sib npaug txhua feem los ntawm tus lej ntawm lwm tus.

Piv txwv li, txhawm rau nrhiav cov lej sib faib hauv 1/3 + 2/5, sib npaug "1" thiab "3" los ntawm "5", tom qab ntawd muab "2" thiab "5" los ntawm "3". Tam sim no, koj muaj qhov ntxiv ntawm 5/15 + 6/15. Tom qab ntawd, koj tuaj yeem xam cov feem feem

Xeem Fractions Kauj Ruam 7
Xeem Fractions Kauj Ruam 7

Kauj Ruam 3. Ntxiv lossis rho tus zauv los laij lej

Thaum koj tau pom cov lej sib txawv thiab sib npaug cov lej (yog tias tsim nyog), koj npaj tau ntxiv lossis rho tawm. Ntxiv lossis rho tus lej thiab tso cov txiaj ntsig saum toj no txoj kab faib. Sau cov feem sib faib hauv qab kab ntawv.

  • Piv txwv, 3/6 - 2/6 = 1/6.
  • Tsis txhob ntxiv lossis rho tawm cov denominators.
Xeem Fractions Kauj Ruam 8
Xeem Fractions Kauj Ruam 8

Kauj Ruam 4. Ua kom yooj yim cov txiaj ntsig yog tias tsim nyog

Yog tias yav dhau los koj xav tau los nrhiav qhov sib txawv, koj yuav tau txais ib feem loj uas koj tuaj yeem yooj yim dua. Piv txwv, yog tias koj ntxiv 8/32 +12/32, koj yuav tau txais "20/32" raws li qhov tshwm sim. Cov feem no tuaj yeem ua kom yooj yim rau "5/8".

Txoj Kev 3 ntawm 4: Muab Zauv thiab Yooj Yim Yooj Yim

Xeem Fractions Kauj Ruam 9
Xeem Fractions Kauj Ruam 9

Kauj Ruam 1. Hloov cov feem sib xyaw lossis cov lej sib xyaw rau cov feem uas tsis raug

Txhawm rau ua kom sib npaug yooj yim dua, koj yuav tsum hloov pauv txhua tus lej mus rau qhov tsim nyog lossis tsis raug ib feem. Yog tias koj muaj tus lej lossis tus lej sib xyaw uas yuav tsum tau muab sib npaug, xub hloov lawv mus rau qhov feem ntau (ntuj lossis tsis raug).

  • Piv txwv li, txhawm rau muab 2/5 los ntawm 7, hloov "7" rau ib feem. Tom qab ntawd, koj tuaj yeem sib npaug 2/5 los ntawm 7/1.
  • Yog tias koj muaj tus lej sib xyaw zoo li 1 1/3, hloov nws mus rau qhov feem tsis raug ("4/3") ua ntej sib npaug.
Xeem Fractions Kauj Ruam 10
Xeem Fractions Kauj Ruam 10

Kauj Ruam 2. Muab txhua tus zauv thiab cov zauv sib faib

Es tsis txhob ua ntxiv, sib npaug tus lej thiab sau cov txiaj ntsig saum toj no txoj kab faib. Koj kuj yuav tsum tau muab cov lej faib thiab sau qhov tshwm sim hauv qab kab.

Piv txwv li, kom sib npaug 1/3 los ntawm 3/4, sib npaug "1" los ntawm "3" kom tau tus lej. Muab tus lej "3" los "4" kom tau tus lej. Cov lus teb rau qhov sib ntxiv yog "3/12"

Xeem Fractions Kauj Ruam 11
Xeem Fractions Kauj Ruam 11

Kauj Ruam 3. Ua kom yooj yim

Feem ntau, koj yuav tsum tau txo qhov txiaj ntsig mus rau daim ntawv yooj yim dua, tshwj xeeb tshaj yog tias koj pib muaj cov feem uas tsis zoo li qub. Nrhiav qhov tseem ceeb tshaj plaws thiab siv qhov xwm txheej ntawd kom yooj yim rau cov lej thiab cov lej sib cais.

Piv txwv, rau feem 3/12, qhov loj tshaj plaws ntawm "3" thiab "12" yog "3". Faib txhua feem ntawm feem ntawm "3" kom txog thaum koj tau txais cov feem "1/4"

Txoj Kev 4 ntawm 4: Faib Fractions

Xeem Fractions Kauj Ruam 12
Xeem Fractions Kauj Ruam 12

Kauj Ruam 1. Rov qab txoj haujlwm ntawm qhov feem thib ob

Txoj hauv kev yooj yim tshaj plaws los faib cov faib, txawm tias cov feem sib txawv nrog cov lej sib txawv, yog thim rov qab txoj haujlwm ntawm feem thib ob ua ntej koj suav qhov tshwm sim.

Piv txwv li, rau qhov teeb meem 5/4 1/2, thim txoj haujlwm ntawm feem "1/2" los ua "2/1"

Xeem Fractions Kauj Ruam 13
Xeem Fractions Kauj Ruam 13

Kauj Ruam 2. Muab tus zauv thiab tus zauv sib faib

Muab cov zauv faib ncaj qha los ua tus lej. Sau qhov txiaj ntsig saum toj no txoj kab sib faib, tom qab ntawd sib npaug cov lej. Sau cov khoom ntawm cov denominators hauv qab kab.

Rau qhov piv txwv yav dhau los, sib npaug 5/4 los ntawm 2/1 kom tau "10/4"

Xeem Fractions Kauj Ruam 14
Xeem Fractions Kauj Ruam 14

Kauj Ruam 3. Ua kom yooj yim cov txiaj ntsig yog tias tsim nyog

Yog tias qhov txiaj ntsig ntawm kev faib tawm yog ib feem tsis raug lossis tuaj yeem txo qis, ua kom yooj yim dua. Siv qhov tseem ceeb tshaj plaws los txo qhov feem.

  • Piv txwv, qhov tseem ceeb tshaj plaws hauv feem 10/4 yog "2" yog li qhov tshwm sim ntawm kev yooj yim dhau los "5/2" (10 faib ua 2, thiab 4 faib ua 2).
  • Txij li qhov tshwm sim ntawm kev yooj yim yog ib feem tsis raug, koj tuaj yeem hloov nws mus rau ib qho lej thiab ib feem (cov lej sib xyaw). Yog li, 5/2 tuaj yeem hloov mus rau "2".

Lub tswv yim

  • Yog tias koj tab tom ua haujlwm nrog cov zauv nyuaj, koj yuav tsum tau ua qee cov kauj ruam ntxiv los ua kom yooj yim cov feem. Txawm li cas los xij, qhov kev yooj yim nws tus kheej yog ib feem yuav tsum tau ua ntawm cov txheej txheem suav.
  • Ib txwm sau ib feem me me kom txo tau txoj kev pheej hmoo ntawm kev suav tsis txheeb.

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