Txoj Hauv Kev Los Pab Koj Kom Tiav Sai Hauv Koj Lub Siab Xav Qhov Nyiaj Ntawm Daim Tshev Thiab Nyiaj Cheb Hauv Khw

2024 Tus sau: Bailey Albertson | [email protected]. Kawg hloov kho: 2023-12-17 12:59

Yuav ua li cas kawm kom paub suav nyob hauv koj lub taub hau thiaj li tsis ua rau muaj kev kub ntxhov hauv cov ntawv cim npe thiab xa khoom hauv khw

Lub tsev kawm ntawv nrhiav txhawm rau txhim kho cov tub ntxhais kawm, nkag siab hauv lawv txoj kev paub ntau. Tab sis ob peb xyoos tom qab ua tiav nws, peb nkag siab tias logarithms thiab txiaj ntsig ntawm cov khoom siv tshuaj lom neeg tsis muaj txiaj ntsig zoo rau peb. Tab sis cov lej yooj yim tsis tso peb ib pliag, vim nws tsis yog ib qho yooj yim uas yuav tawm hauv lub xov tooj thiab tig lub laij kom suav lub laij loj ntawm daim tshev thiab tus nqi ntawm cov luv nqi.

Feem pua ntawm cov nyiaj

Thaum mus xyuas ib lub khw muag khoom lossis xaj khoom hauv Is Taws Nem, peb suav peb cov peev nyiaj, suav txog cov nyiaj cheb tau muab. Nws muaj qhov ua kom yooj yim heev rau kev xam cov feem pua.

Tsuas faib cov nyiaj hauv daim tshev los ntawm 5 - qhov no yog koj qhov luv nqi. Yog tias qhov kev yuav khoom yuav nqi 85 rubles, ces 20% ntawm 85 yog xam raws li hauv qab no: 85/5 = 17.17 rubles - tus nqi ntawm koj cov txiaj ntsig. Tib yam yog nrog 40%. Faib tus nqi ntawm 5 (koj yuav pom 20%) thiab khoo los ntawm 2. 85/5 = 17, 17 x 2 = 34.34 yog tus nqi ntawm 40% luv nqi ntawm 85.

Txhawm rau 10%, tsuas yog tso rau pem hauv ntej ntawm tus lej kawg. Ntawd yog, 10% ntawm 1,568 yog 156.8.

Tawm cov lej uas muaj ntau tshooj (multidigit)

Yog tias koj yuav ntau yam khoom uas muaj multidigit tus nqi thiab ntxiv cov tsis meej pem, tsoo lawv thiab ntxiv txhua nyias.

Ua ntej, peb faib lawv ua cov lej: 1 256 (1,000, 200, 50 thiab 6), 372 (300, 70 thiab 2). Tam sim no peb ntxiv los ntawm qeb: ntau txhiab (1000 + 0), ntau pua (200 + 300), kaum (50 + 70) thiab cov koog (6 + 2). Peb tau txais 1,000 + 500 + 120 + 8 = 1,628.

Muab ntau yog tias tus nqe pib xaus rau 9 lossis 99

Ntau lub khw muag khoom rau peb tsis meej nrog cov nqi cim npe uas xaus rau 9 lossis 99. Yog tias koj yuav ntau yam khoom nrog tus nqi zoo sib xws thiab xav paub tag nrho cov nyiaj, muab tus naj npawb ntawm cov khoom koj yuav 10 lossis 100 thiab rho qhov koj ntxiv. Cia peb hais tias koj yuav 12 tswm ciab ntawm 99 rubles: 12 x (100 - 1) = 1,200 - 12 = 1,188.

Txooj muab 2

Tib lub tswv yim yuav pab muab ntau tus naj npawb xaus rau hauv 9. Tsuas yog ntxiv ib qho, uas yog, mus rau kaum tawm, thiab rho tus naj npawb ntawm cov khoom.

Tus nqi ntawm ob lub chocolate hauv 139 rubles yog qhov yooj yim los xam raws li hauv qab no: (139 + 1) x 2 = (140 x 2) - 2 = 280 - 2 = 278.

Ntxiv ob tug lej

Kev sib puag ncig yuav pab koj kom ntau tshaj li tus lej qub. Piv txwv li, koj yuav tsum paub qhov tawm ntawm plaub yam khoom nrog tus nqi: 54, 79, 23 thiab 58. 79 thiab 58 peb tuaj yeem ncig mus txog 80 (79 + 1) thiab 60 (58 + 2), raws.

Peb tau txais: 54 + 23+ 80 + 60 = 77 + 140 = 217. Tam sim no cia peb rho cov nqi uas peb tau txais: 217 - 3 = 214. Qhov no yog qhov yuav tsum tau suav.

Nta ntawm rho tawm

Ib qho qauv zoo sib xws yog siv rau kev rho tawm. Tsuas yog suav puag ncig cov lej, thiab tom kawg ntxiv qhov nyiaj ntxiv uas lawv tau nce ntxiv.

1 565 - 57 - 29. Hloov 57 txog 60 (50 + 3) thiab 29 txog 30 (29 + 1). Peb tau txais 1 565 - 60 - 30 = 1 505 - 30 = 1 475. Tam sim no peb ntxiv tus lej ntawm cov lej uas peb tau muab rho tawm: 1 475 + 4 = 1 479.