Hauv kev tshaj tawm no, peb yuav xav txog dab tsi yog qhov kev sib tshuam ntawm ob kab, thiab yuav ua li cas thiaj nrhiav tau nws cov kev sib koom tes sib txawv. Peb tseem yuav tshuaj xyuas ib qho piv txwv ntawm kev daws teeb meem ntawm lub ncauj lus no.
Nrhiav qhov chaw ntawm qhov chaw ntawm kev sib tshuam
kev sib tshuam Cov kab uas muaj ib qho ntsiab lus yog hu ua.
M yog lub ntsiab lus ntawm kev sib tshuam ntawm cov kab. Nws belongs rau ob qho tib si ntawm lawv, uas txhais tau hais tias nws cov kev tswj hwm yuav tsum ua kom txaus siab rau ob qho tib si ntawm lawv qhov sib npaug.
Txhawm rau nrhiav cov kev sib koom ua ke ntawm qhov taw tes no ntawm lub dav hlau, koj tuaj yeem siv ob txoj hauv kev:
- duab - kos cov duab ntawm cov kab ncaj nraim ntawm lub dav hlau sib koom tes thiab pom lawv qhov kev sib tshuam (tsis tas yuav siv tau);
- analytical yog ib txoj hauv kev ntau dua. Peb muab cov kab zauv sib npaug rau hauv ib qho system. Tom qab ntawd peb daws nws thiab tau txais cov kev tswj hwm xav tau. Yuav ua li cas cov kab coj kev hwm rau ib leeg yog nyob ntawm tus naj npawb ntawm cov kev daws teeb meem:
- ib qho kev daws teeb meem - sib tshuam;
- cov kev daws teeb meem yog tib yam;
- tsis muaj kev daws teeb meem - parallel, piv txwv li tsis sib tshuam.
Piv txwv ntawm qhov teeb meem
Nrhiav cov coordinates ntawm lub point ntawm kev sib tshuam ntawm kab
tshuaj
Cia peb ua ib qho kev sib npaug thiab daws nws:
Hauv thawj kab zauv, peb nthuav qhia x ntawm y:
x = y – 6
Tam sim no peb hloov qhov tshwm sim qhia rau hauv qhov sib npaug thib ob es tsis txhob x:
y = 2 (y – 6) – 8
y = 2y – 12 – 8
y – 2y = –12 – 8
-y = -20
y = 20 os
Yog li, x = 20 – 6 = 14
Yog li ntawd, lub ntsiab lus ntawm kev sib tshuam ntawm cov kab uas tau muab muaj kev tswj hwm