Yuav ua li cas txhais cov feeb rau hauv cov sij hawm thiab lwm tus qauv: kev piv txwv, txoj kev, kev lom zem lub sij hawm

Cia peb saib seb yuav txhais cov feeb li cas thiab ua lwm yam. Yuav pib nrog, peb pom zoo tias kev paub ntawm kev xav tau yuav tsum tau ua. Tom qab tag nrho, koj tuaj yeem ua tsis tau cov lus teb ntawm no. Yog tias koj tsis ua raws li koj siab los yog ib daim ntawv, ces siv lub laij zauv. Hauv qab no koj yuav pom tias yuav luag tag nrho cov kev xaiv kom txhais cov feeb los ua pes tsawg teev.

Los ntawm ancient sij hawm mus rau tam sim no

Saib ntawm tus xov tooj. Nws muaj 60 zaus, uas yog 60 feeb (feeb). Leej twg yog phooj ywg nrog kev ua lej, nws tau pom ntev ntev tias qhov kev tshawb fawb no zoo li kev ua kom pom tseeb, txawj xav, ua kom txaus ntshai. Cov neeg thaum ub tsis tau ua txhaum dua li peb cov neeg tuaj sib tham, tab sis lawv tseem ua tau zoo.

Hnub no peb muaj dab tsi:

• 1 teev yog 60 feeb;
• 1 feeb sib npaug ntawm 60 feeb;
• 1 teev muaj 3600 vib nas this.

Tau kawg, 3600 vib nas this tau los ntawm kev sib ntxiv 60 feeb * 60 vib nas this. Cia peb ua tib zoo saib tus xov tooj: piv txwv li, lub sijhawm (luv xub) yog 12, thiab feeb (ntev) - qhia tias tam sim no 20 feeb. Tias yog nees nkaum feeb ntawm thawj. Tam sim no xav seb yuav txhais pes tsawg lub sij hawm ua ke nrog cov qauv no.

Cov lus teb yooj yim thiab cov lus teb txog li 1 teev

Nco ntsoov cov ntsiab lus hauv tsev kawm ntawv qib qis thiab qib 5: muaj cov zauv feem. Peb tau txais dab tsi ntawm? 1 teev = 60 min. Thiab peb tsuas muaj 20 feeb xwb. Nws tuaj yeem tsis muaj tseeb tias tsuas yog 20/60 teev dhau los. Tiam sis peb paub tias cov zauv feem yuav txo tau. Cia peb ua nws:

20/60 = 1/3.

Tag nrho dhau 1/3 teev los yog, yog tias peb faib, ces 0.33.

Xav txog lwm qhov kev xaiv: lub quarter ntawm ib teev txhais li cas? Kuv yuav hloov cov feeb li cas rau ob peb hnub ua ntej rov qab?

1/4 teev = 15 feeb. Qhov no tau tshwm sim li cas?

15 feeb / 60 na thi. = 1/4.

Yuav ua li cas thiaj li teev tseg 10 feeb hauv ib lub moos? Cov txheej txheem ntawm kev daws yog indentic:

10 min./60 min. = 1/6 teev = 0.167 teev. Kom meej meej, xws li ib cov ntaub ntawv tsis yog lawm, yog li ntawd nws pom zoo kom tsis txhob txhais 10 feeb.

Ntau tshaj li ib teev

Peb coob tus tau pom, xws li, piv txwv, sau rau hauv daim ntawv tshaj tawm rau zaj yeeb yaj kiab nws lub sijhawm: 150 feeb. Yuav ua li cas hloov cov feeb mus rau cov sij hawm hauv qhov no? Nco ntsoov tias yuav tsis muaj ntau feem. Vim li cas? Vim hais tias nyob rau hauv tshooj dhau los nws yog txog lub sij hawm uas tau ua ntev dua 1 teev. Thiab tam sim no, nyob rau hauv tsis tooj, txhua yam. Nws yuav yooj yim rau saib ntawm ib sab, tab sis nws tseem ua tau yooj yim dua.

Yog li ntawd, rov qab mus rau 150 feeb. Txhob xav ntev, cia peb xav txog 60 feeb kom txog thaum peb mus txog 150: 60 feeb. + 60 min. = 120. Peb yuav tsum nres, vim yog tias koj ntxiv 60 feeb ntxiv, nws yuav 180, thiab peb tsuas muaj 150 feeb ntawm xinesmas. Peb rov qab los rau peb 120 feeb. Ntawm chav kawm, qhov no yog 2 teev. Thiab tam sim no los ntawm 150 feeb peb yuav rho tawm 120. Nws yuav tig tawm 30.

Koj tuaj yeem ua nws txawv. Txav rau 120 feeb thiab lub hlwb ntes nrog lub ncua sij hawm uas ploj lawm ib nrab. Ntawm no yog qhov tshwm sim rau koj: 150 na thi. = 2 teev 30 feeb. = 2.5 teev.

Thiab ua li cas los ntawm 1.5 xuab moos ib feeb? Tam sim ntawd xa 1 xuab moos 30 feeb: 60 + 30 = 90 feeb.

Lwm qhov kev xaiv: tus zauv feem feem pua yog ib qho integer thiab tsib kaum, uas tom qab cov pom muaj daim ntawv: 15/10 = 3/2. Qhov tseeb, 1.5 teev yog 3/2 teev.

Cia li xav txog ib zaj lus qhia hauv qeb 3, uas yog txuam nrog cov zauv. Muaj cov xim duab uas qhia meej meej tias 5/6 lossis 1/2 txhais tau li cas.

Vim li cas thiaj yuav tsum muaj teeb meem li no?

Cia li xav tias koj tab tom kawm txog lub sijhawm hluav taws xob. Feem ntau, sau, piv txwv, sij hawm mus txawv tebchaws: 1 teev 5 feeb. Nws zoo nkaus li tias txhua yam yog qhov tseeb. Tab sis cia peb xav li cas qhov no yog feeb? 65 feeb. Lwm yam: 2 teev 35 feeb? Cia peb xam:

2 xuab moos = 120 feeb, ntxiv dua 35 feeb. Raws li qhov tshwm sim: 120 + 35 = 155 feeb.

Yog li ntawd, peb tau pom tias yuav txhais pes tsawg lub sij hawm ua ke thiab ua lwm yam. Yuav kom paub sai npaum li cas, nws yog ntshaw kom paub cov hauv paus hauv kev ua lej. Yog tias koj tsis tau txais kev xam pom ntawm lub hlwb, koj yuav tsum daws qhov teeb meem ntawm ib daim ntawv.