Qhov sib ntxiv ntawm teeb A yog txhais tias a teeb uas muaj cov ntsiab lus tam sim no hauv cov txheej txheem thoob ntiaj teb tab sis tsis nyob hauv teeb A. Piv txwv li, teeb U={2, 4, 6, 8, 10, 12} thiab teeb A={4, 6, 8}, ces qhov ntxiv ntawm set A, A′={2, 10, 12}.
Koj pom qhov sib ntxiv li cas?
Yuav kom pom qhov sib ntxiv ntawm lub kaum sab xis, rho tawm lub kaum sab xis ntsuas ntawm 90 degrees. Qhov tshwm sim yuav yog qhov ntxiv. Qhov ntsuas ntawm lub kaum sab xis yog 50 degrees.
Kev ua lej txhais li cas hauv kev ua lej?
In probability theory, the complement of any events A is the event [tsis A], i.e. the event that A tsis tshwm sim. Qhov xwm txheej A thiab nws cov khoom ntxiv [tsis yog A] yog kev sib koom ua ke thiab tag nrho.
Lub ntsiab lus ntawm kev ua lej yog dab tsi?
Qhov ntxiv yog tus nqi koj yuav tsum tau ntxiv rau qee yam kom nws "tag nrho". Piv txwv li, hauv geometry, ob lub kaum sab xis tau hais kom ua tiav thaum lawv ntxiv txog 90 °. Ib lub kaum yog hais tias yog qhov sib ntxiv ntawm lwm qhov. Hauv daim duab hauv qab no, cov ces kaum PQR thiab RQS yog ua tiav.
piv txwv ntxiv yog dab tsi?
Nyob hauv cov qauv sau ntawv, qhov sib ntxiv ntawm qhov sib txuas lus qhia yog ib pawg lus lossis pawg neeg uas tuaj tom qab qhov lus qhia thiab piav qhia lossis txheeb xyuas qhov kev kawm. Piv txwv li, nyob rau hauv kab lus 'Lawv xav nkees heev', ' nkees heev' yog qhov ntxiv. Hauv 'Lawv yog cov tub ntxhais kawm', 'cov tub ntxhais kawm' yog qhov ntxiv.
