Cov txheej txheem:
2024 Tus sau: Malcolm Clapton | [email protected]. Kawg hloov kho: 2023-12-17 03:58
Xam seb lub sij hawm twg cov xub yuav qhia nyob rau hauv ib hnub, sim teem lub tswb kom meej thiab tsis nco ib qho tseem ceeb hu.
Teeb meem 1
Sergei yuav ib lub moos nrog txhais tes hauv khw, thiab hauv tsev pom tias lawv nyob 20 vib nas this tom qab ib teev. Raws li qhov xwm txheej, Sergei yog tus kws sim, yog li nws coj thiab teem sijhawm tes thiab feeb tes kom meej 12. Lub moos yuav qhia lub sijhawm twg hauv ib hnub?
1. Rau 1 teev, lub moos qeeb tom qab 20 vib nas this, rau 3 teev - los ntawm 1 feeb.
2. Muaj 24 teev hauv ib hnub. Qhov no txhais tau hais tias nyob rau hauv 1 hnub lub moos yuav lag tom qab 24 ÷ 3 = 8 feeb.
3. Yog hais tias lub moos tsis lag tom qab, nyob rau hauv ib hnub ob txhais tes yuav converge dua nyob ib ncig ntawm 12. Tab sis lub moos yog lagging qab thiab yuav qhia lub sij hawm nram qab no: 12 teev - 8 feeb = 11 teev 52 feeb.
Qhia teb Nthuav teb
Ua haujlwm 2
Sergei lub moos pib poob qis los ntawm 5 feeb hauv ib teev. Tam sim no yog 6 thaum sawv ntxov, thiab thaum tav su nws muaj xov tooj ua haujlwm tseem ceeb. Yuav ntev npaum li cas Sergey yuav tsum teem tes ntawm lub moos kom thaum 12 tav su lawv qhia cov lej raug?
Muaj 6 teev tseg ua ntej hu. Rau 1 teev lub moos yog 5 feeb tom qab, rau 6 teev nws yuav yog 30 feeb tom qab, qhov no txhais tau hais tias ob txhais tes yuav tsum tau txav mus rau pem hauv ntej ib nrab teev, uas yog, thaum 6:30.
Qhia teb Nthuav teb
Teeb meem 3
Sergei pom tias nws lub moos muaj lub tswb moos. Nws mus pw, nws teem caij raws sijhawm ntawm lub moos - 22:00. Nws yuav siv sij hawm ntev npaum li cas los teem lub tswb kom nws rings raws nraim 6 thaum sawv ntxov, yog tias lub moos tam sim no maj nrawm los ntawm 9 feeb ib hnub?
Sergey yuav pw rau 8 teev, los ntawm 22:00 txog 6:00. Rau ib hnub, cov sij hawm ua ntej los ntawm 9 feeb, thiab rau 8 teev qhov sib txawv yuav yog 24 ÷ 8 = 3 feeb. Qhov no txhais tau tias thaum 6:00, thaum Sergei yuav tsum sawv, lub moos yuav qhia 6:03. Lub sijhawm no, koj yuav tsum pib lub tswb.
Qhia teb Nthuav teb
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