No, koj tsis tuaj yeem hla ntau ntxiv thaum ntxiv cov feem. Hla qhov sib npaug tsuas yog thaum koj yuav tsum txiav txim siab seb ib feem ntau dua li lwm tus, lossis yog tias koj tab tom sim nrhiav tus lej uas ploj lawm lossis tus lej hauv qhov sib npaug.
Vim li cas tus lej sib npaug muaj tseeb?
Cross multiplication yog li ntawd tsuas yog ib qho shortcut los nrhiav cov lej tshiab no. Peb tab tom hloov pauv cov feem muab faib rau cov feem sib npaug nrog tib tus lej - cov khoom ntawm ob tus lej - thiab sib piv cov lej.
Vim li cas koj tsis tuaj yeem hla ntau qhov tsis sib xws?
Yog vim li cas peb qhov kev thov thawj zaug ua tsis tau yog vim ib zaug peb muab ob sab ntawm qhov tsis sib xws los ntawm tus lej tsis zoo, daim ntawv tsis sib xws yuav tsum tau rov qab. … Tab sis yog tias peb muab ob sab los ntawm − 1 -1 −1, thaum khaws qhov tsis sib xws kos npe zoo ib yam, peb muaj 1 > 2, 1 > 2, 1>2, uas yog qhov tseeb tiag.
Vim li cas hla kev ua haujlwm thaum sib piv cov feem?
Los ntawm kev sib piv cov feem uas siv tus lej sib npaug, peb poob lub tswv yim ntawm kev nrhiav cov feem sib npaug, uas yog vim li cas kev sib tw ua haujlwm. … Cov cuab yeej no hais tias yog peb muab ob sab ntawm qhov sib npaug lossis qhov tsis sib xws los ntawm tib tus lej, cov txiaj ntsig ntawm txhua sab tseem sib npaug.
Vim li cas tus lej sib npaug ua haujlwm thaum daws qhov sib npaug sib npaug?
Daim duab 18.1 Hla multiplying tshem tawm covdenominators nyob rau hauv ib qho kev faib ua sai sai, tsis tas yuav suav ib tug tsawg tshaj denominator. … Kev daws: Txij li qhov no yog ib feem, koj tuaj yeem hla ntau kom tshem tawm cov feem.
