Fraction vs Ratio
Muaj ntau txoj hauv kev los sib piv qhov ntau thiab tsawg ntawm cov khoom sib xws, tawm ntawm cov, feem thiab qhov piv yog ob qhov nrov tshaj plaws.
Cia peb xav txog qhov piv txwv hauv qab no:
Ib qho khoom qab zib tau muab faib ua 12 daim. Tom noj 4 daim thiab David noj 8 daim ntxiv.
Peb tuaj yeem sib piv cov khoom ntawm cov qhob noom xim kasfes uas lawv tau noj ntau yam.
(i). Qhov txawv ntawm daim ntawm cov qhob noom xim kasfes uas lawv noj yog 8 - 4=4.
Yog li ntawd, Tom thiaj noj 4 daim tsawg dua li Davi ua.
(ii). (Tus nab npawb ntawm cov qhob noom xim kasfes uas Tom tau noj)/(Tus naj npawb ntawm cov qhob noom xim kasfes uas David noj)=4/8=1/2
ie, Tom tau noj ib nrab ntawm cov khoom uas Davi ua.
Ratio
Kev sib piv xws li (ii) ntawm qhov piv txwv saum toj no yog hu ua kev sib piv los ntawm kev faib. Thaum ob qhov zoo sib xws yog muab piv los ntawm kev faib, qhov sib piv yog tsim. Rau qhov piv txwv saum toj no, peb hais tias qhov piv ntawm cov khoom qab zib uas Tom tau noj rau cov khoom qab zib uas David noj yog 4 txog 8.
Qhov piv ntawm ob qhov ntau yog tus lej uas qhia txog kev sib raug zoo ntawm ob lossis ntau qhov sib txheeb. Qhov piv ntawm a rau b (b ≠ 0) yog qhia los ntawm a/b los yog a rau b lossis a: b. a yog 'thawj lub sij hawm' thiab yog lub npe hu ua antecedent thiab 'b' yog lub sij hawm thib ob los yog qhov tshwm sim.
Hauv qhov piv txwv saum toj no, qhov piv yog 4: 8. Qhov ntawd kuj tuaj yeem sau ua 1: 2, txij li 4/8=1/2=1: 2 qhia qhov piv ntawm cov nqe lus qis tshaj lossis hauv daim ntawv yooj yim.
Txij li a / b=ma / mb rau txhua tus naj npawb m, qhov piv txwv a: b sib npaug li tus piv ma: mb. Yog li ntawd, tus nqi ntawm qhov sib piv tseem zoo ib yam yog qhov qub thiab qhov tshwm sim tau muab faib los yog muab faib los ntawm tib qhov ntau.
Peb kuj tuaj yeem sib piv ntau dua ob qhov ntau. Piv txwv li, qhov piv ntawm peb qhov ntau tuaj yeem qhia tau tias yog: b: c.
Fraction
Ib feem yog piv txwv ntawm ib hom kev sib piv. Ib feem tuaj yeem txhais tau tias yog "ib feem - tag nrho" kev sib raug zoo ntawm ib qho ntau dua li kev sib piv ntawm ob qhov sib txawv. Thaum peb siv ib feem los sawv cev ntawm qhov sib piv ntawm ob, nws tsuas yog lub cim. Nws tsis yog sib npaug rau tus nqi tau los ntawm kev faib.
Piv txwv li, qhov piv ntawm 1: 2 peb kuj tuaj yeem nthuav tawm li 1/2. Tus nqi ntawm qhov kev faib no yog sib npaug rau 0.5. Txawm li cas los xij, yog tias peb siv ib feem ua piv txwv, peb tsis tuaj yeem hais tias qhov piv 1/2 yog sib npaug rau 0.5, raws li tag nrho muab faib ua peb ntu.
Qhov txawv ntawm Fraction thiab Ratio yog dab tsi?
• Kev sib piv yog kev sib raug zoo ntawm ob lossis ntau qhov ntau.
• Ib feem yog hom piv.
