2024 Tus sau: Malcolm Clapton | [email protected]. Kawg hloov kho: 2023-12-17 03:58
Xav rov qab mus rau geometry thiab siv koj lub tswv yim los nrhiav cov lus teb zoo.
Xyoo 1995, cov tub ntxhais kawm qib yim los ntawm 16 lub teb chaws tau xeem TIMSS, uas yog siv los ntsuas qhov zoo ntawm kev kawm lej hauv tsev kawm ntawv. Ib qho ntawm cov haujlwm zoo li nyuaj tshwj xeeb rau cov tub ntxhais kawm: tsuas yog 10% ntawm Kev Ua lej thiab Kev Tshawb Fawb Txog Kev Tshawb Fawb hauv xyoo kawg ntawm Tsev Kawm Ntawv Qib Siab tau daws nws. Xyuas seb nws puas nyob hauv koj cov hniav.
Ib txoj hlua yog symmetrically raug mob ntawm ib puag ncig pas nrig. Nws ua raws nraim 4 tig ib ncig ntawm nws. Tus pas nrig yog 12 centimeters ntev thiab nws ncig yog 4 centimeters. Qhov ntev ntawm txoj hlua yog dab tsi?
Cia peb xav txog tias tus pas nrig yog ua los ntawm cardboard. Yog tias koj txiav nws raws txoj kab ncaj nraim, thiab tom qab ntawd nthuav tawm thiab flatten nws, koj tau txais ib daim duab plaub 12 × 4 cm, txoj hlua lub qhov txhab yuav tig mus rau hauv 4 kab pheeb ces kaum, txhua qhov yog hypotenuse ntawm txoj cai daim duab peb sab.
Duab: Anna Guridova / Lifehacker
Qhov ntev ntawm ib tug ob txhais ceg ntawm lub kaum sab xis yog sib npaug rau lub voj voog ntawm tus pas nrig, uas yog, 4 cm. Qhov ntev ntawm lwm ceg yog ib feem plaub ntawm qhov ntev ntawm tus pas nrig, uas yog, 12 ÷ 4 = 3 cm.
Yuav kom nrhiav tau lub hypotenuse, koj yuav tsum siv Pythagorean theorem. Nws suab zoo li no: nyob rau hauv ib txoj cai-lub kaum sab xis daim duab peb sab, lub square ntawm lub hypotenuse yog sib npaug zos rau cov sum ntawm cov squares ntawm ob txhais ceg.
Xam cov square ntawm hypotenuse: 32 + 42 = 9 + 16 = 25. Li no, qhov ntev ntawm lub hypotenuse yog √25 = 5 cm. Yog li ntawd, tag nrho cov hlua ntev yog sib npaug rau cov sum ntawm 4 hypotenuses, uas yog, 20 cm.
Qhia teb Nthuav teb
Thawj qhov teeb meem tuaj yeem pom.
Pom zoo:
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