Cov txheej txheem:
2024 Tus sau: Malcolm Clapton | [email protected]. Kawg hloov kho: 2023-12-17 03:58
Ib qho lus qhia yooj yim rau cov uas yuav tsum nco ntsoov lub tsev kawm ntawv cov ntaub ntawv kawm lossis pab tus menyuam.
Dab tsi yog cov feem
Ib feem yog tus lej uas muaj ib lossis ntau qhov sib npaug ntawm ib chav. Hauv cov ntsiab lus yooj yim, tus lej no qhia txog ib feem ntawm ib yam dab tsi, piv txwv li, ib daim ncuav mog qab zib, lossis tag nrho nrog ob peb qhov ntxiv, piv txwv li, ib qho ncuav mog qab zib thiab peb daim ntawm lwm qhov.
Cov feem ntau muaj xws li tus lej (sab saum toj) thiab tus lej (hauv qab), sib cais los ntawm kab rov tav lossis hlais. Tus denominator qhia txog pes tsawg feem peb cov ncuav mog qab zib raws li kev cai tuaj yeem muab faib ua, thiab tus lej - pes tsawg ntawm lawv muaj: 1/2, 3/4, 9/10.
Cov feem ntau yog ob qho tib si yog thiab tsis yog. Tus lej tseeb yog tsawg dua tus lej (5/8, 7/15), hos cov tsis ncaj ncees, ntawm qhov tsis sib xws, muaj ntau dua (8/5, 15/7). Tag nrho thiab feem ntau tuaj yeem txawv ntawm qhov tsis raug: 13/5, 21/7… Tus lej tshwm sim yuav raug hu ua ib feem sib xyaw.
Tseem muaj cov zauv feem. Lawv muaj lub zog ntawm 10 nyob rau hauv tus lej, thiab lawv tau sau sib txawv - sib cais los ntawm commas: 0, 5, 0, 98. Txawm hais tias tus lej feem ntau kuj tuaj yeem sawv cev rau hauv daim ntawv zoo tib yam: 5/10, 98/100.
Yuav ua li cas ntxiv cov feem
Ordinary nrog tib denominators
Txhawm rau ntxiv cov zauv feem nrog tib tus lej, tsuas yog ntxiv cov lej thiab tawm cov lej tsis hloov pauv. Piv txwv li: 1/5 + 2/5 = 3/5; 9/6 + 10/6 = 19/6 = 31/6.
Ordinary nrog sib txawv denominators
Ua ntej koj yuav tsum coj cov feem ntau mus rau ib tug ntau denominator. Txhawm rau ua qhov no, nrhiav tus lej tsawg tshaj plaws uas sib npaug sib faib los ntawm koj ob tus lej. Piv txwv li, rau feem 5/6 thiab 4/9 tus lej no yog 18.
Tom qab ntawd faib nws los ntawm koj cov denominators - thiab koj tau txais qhov hu ua qhov tseem ceeb ntxiv (18: 6 = 3, 18: 9 = 2). Qhov no yog tus lej uas ob sab ntawm cov feem yuav tsum tau muab sib npaug los coj nws mus rau tus lej tshiab. Ntawd yog: 5x3 ua/6x3 ua + 4x2 ib/9x2 ib = 15/18 + 8/18.
Nws tseem tsuas yog rov ua cov txheej txheem los ntawm kab lus dhau los, ntxiv cov lej. Hauv peb qhov piv txwv, peb tau txais 23/18, lub 15/18yog koj xaiv tag nrho ib feem.
Mixed feem
Muaj ob peb txoj hauv kev ntxiv cov feem ntau. Qhov yooj yim tshaj plaws yog suav tag nrho thiab feem ntau cais. Piv txwv li, koj yuav tsum xam qhov ntau npaum li cas 31/5 + 42/3… Ua ntej, ntxiv 3 + 4 thiab tau txais 7. Tom qab ntawd peb txav mus rau qhov feem ntau: 1/5 + 2/3 = 1 x 3/5x3 ua + 2 x 5/3x5 ua = 3/15 + 10/15 = 13/15… Thiab ua ke - 713/15.
Yog hais tias, thaum ntxiv cov fractional qhov chaw, ib feem tsis raug, nws tseem yuav tsum tau xaiv tag nrho los ntawm nws thiab ntxiv rau yav tas los tau tag nrho ib feem.
Cov zauv feem
Thawj kauj ruam yog kom sib npaug cov lej tom qab tus lej lej. Piv txwv li, koj xav ntxiv cov lej 33, 142 thiab 5, 6. Ntxiv ob xoom rau feem thib ob - 5, 600. Tam sim no ntxiv cov lej ua ntej tus lej lej (33 + 5) thiab tom qab (142 + 600). yog 38,742.
Yog tias koj tseem tsis tau ua haujlwm zoo nrog cov zauv feem, ntxiv rau hauv kab, zoo li cov lej zoo tib yam. Nco ntsoov tso lub comma hauv qab lub comma. Txoj kev sib ntxiv no yuav ua rau kev suav yooj yim rau koj thaum muaj tus lej "ntxiv" tshwm tom qab tus lej lej.
Piv txwv li, koj yuav tsum nrhiav cov lej ntawm 1, 742 thiab 5, 6. Koj twb paub tias 1 + 5 = 6, thiab 742 + 600 = 1 342, tab sis nyob rau hauv kem koj yuav pom tam sim ntawd chav tsev ntawm 1 342 yuav tsum tau hloov mus, ntxiv rau tag nrho ib feem. Qhov tshwm sim yog 7, 342.
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