Video: Dab tsi yog cov lej thiab cov lej rational Yuav ua li cas cov ntsiab lus kos rau ntawm lub dav hlau sib koom tes?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Raws li peb tau hais, cov ntsiab lus ntawm tswj lub dav hlau yog sawv cev raws li (a, b), qhov twg a thiab b yog tus lej rational . Cov zauv yog tus lej uas tuaj yeem sau ua ib feem, p / q, qhov twg p thiab q yog tus lej . Peb hu x- koom tes ntawm qhov point thiab peb hu b lub y- koom tes ntawm qhov point.
Ua raws li qhov no hauv kev txiav txim siab, dab tsi yog qhov kev sib koom ua haujlwm sib raug zoo?
A rational coordinates yog a ua haujlwm nyob rau hauv qhov chaw txhua tus ntawm nws ua haujlwm yog kev xav ; yog, cov ua haujlwm ntawm cov ntsiab lus yog cov ntsiab lus ntawm thaj teb ntawm kev xav tus lej. Piv txwv li, (2, −78/4) yog a kev xav taw tes hauv 2-dimensional qhov chaw, txij li 2 thiab −78/4 yog kev xav tus lej.
Qhov thib ob, koj ua li cas thiaj nrhiav tau cov kev sib koom ua ke ntawm ib lub ntsiab lus? Rau nrhiav kom paub qhov coordinates ntawm ib qho point hauv koom tes system koj ua qhov opposite. Pib ntawm qhov taw tes thiab ua raws txoj kab ntsug nce lossis nqis mus rau x-axis. muaj koj x- koom tes . Thiab tom qab ntawd ua tib yam tab sis ua raws kab kab rov tav kom pom y- koom tes.
Tsis tas li cov lus nug yog, koj yuav tsim lub dav hlau ua haujlwm li cas?
Rau tsim ib lub dav hlau coordinate , pib nrog ib daim ntawv ntawm daim duab lossis daim phiaj ntawv. Tom ntej no, kos ib kab kab rov tav. Cov kab no hu ua x-axis thiab yog siv los nrhiav qhov tseem ceeb ntawm x. Txhawm rau qhia tias lub axis yeej mus tas li nyob rau hauv ob qho tib si cov lus qhia, siv cov xub me me ntawm txhua qhov kawg ntawm kab.
Qhov piv txwv ntawm lub dav hlau coordinate yog dab tsi?
A tswj lub dav hlau muaj ob tug xov tooj uas sib tshuam, ib tug khiav horizontally, lwm yam khiav vertically. Kab rov tav tus lej ntawm a tswj lub dav hlau yog lub npe hu ua x-axis. Vertical number kab ntawm a tswj lub dav hlau yog lub npe hu ua y-axis.
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