Yuav kom pom cov khoom hla ntawm qhov kev faib ua feem, peb muab cov ntsiab lus sab nraud, hu ua qhov siab, thiab cov ntsiab lus nruab nrab, hu ua txhais tau tias. Ntawm no, 20 thiab 5yog qhov siab tshaj, thiab 25 thiab 4 yog txhais tau.
Tus lej piv txwv yog dab tsi?
Tus plaub tus lej a, b, c thiab d yog lub npe hu ua cov ntsiab lus ntawm kev faib ua feem. Thawj a thiab lub sijhawm kawg d raug xa mus rau cov ntsiab lus siab thaum lub sij hawm thib ob thiab thib peb hauv qhov kev faib ua feem yog hu ua cov ntsiab lus txhais.
Cov lej twg yog qhov sib npaug?
Teb: Ib pawg ntawm cov lej tau hais kom ua piv txwv yog tias daim ntawv yooj yim tshaj plaws ntawm qhov sib npaug. (1) Rau cov lej 28, 16, 21, 12: Daim ntawv yooj yim tshaj plaws ntawm qhov piv ntawm 28: 16 yog 7: 4.
Yuav ua li cas piv txwv ntawm proportions?
Proportion says that two ratios (los yog fractions) sib npaug.
Piv txwv: hlua
- 40m ntawm txoj hlua ntawd hnyav 2kg.
- 200m ntawm txoj hlua ntawd hnyav 10kg.
- etc.
Yuav ua li cas yog tus qauv ntawm proportions?
Tus qauv rau feem pua yog Parts / tag nrho=feem pua / 100. Cov mis no tuaj yeem siv los nrhiav qhov feem pua ntawm qhov muab piv thiab nrhiav tus nqi ploj ntawm ib feem lossis tag nrho.
