Umgaqo olula wesithathu

Umxholo

• Imizekelo yokusetyenziswa komgaqo olula wesithathu
• Iimpawu
• Umsebenzi womgca kumlawuli
• Ulungelelwaniso olungqalileyo nolungafaniyo

Inkqubo ye- Umgaqo olula wesithathu sisixhobo semathematika esisetyenziselwa ukusombulula ngokukhawuleza iingxaki ezibandakanya ubudlelwane ngokuthe ngqo bokulingana phakathi kwezinto ezimbini eziguqukayo.

Kuba ngokuchanekileyo ubeke umthetho olula wesithathu Idatha emithathu kufuneka yaziwe, kwaye inye kuphela esebenza ngokungaziwa: ukuba u-A (ixabiso elaziwayo) ugcina ubudlelwane obuthile kunye no-B (ixabiso elaziwayo), kwaye kuyaziwa ukuba C (ixabiso elaziwayo) no-D (ixabiso elingaziwayo kwaye abizwe ngolu hlobo "olungaziwayo") banobudlelwane obufanayo, kunokwenzeka ukubala ixabiso elingaziwayo D usebenzisa amaxabiso A, B kunye noC.

Imizekelo yokusetyenziswa komgaqo olula wesithathu

1. Ngeeyure ezingamashumi amane ngeveki yomsebenzi, umqeshwa wamkela i-12,000 yeedola, uza kufumana malini ukuba kule veki ilandelayo unokusebenza iiyure ezingamashumi amahlanu?
2. Isithuthuthu sihamba iikhilomitha ezingama-320 kwimizuzu engama-150, zingaphi iikhilomitha ngeyure esasihamba ngazo?
3. Kulo nyaka bekukho iintsuku ezingama-42 zemvula, oko kuthetha ukuba yeyiphi ipesenti yonyaka?
4. Kwiilitha ezingama-50 zamanzi olwandle kukho iigram ezili-1300 zetyuwa, zingaphi iilitha eziyi-11600 zegrem eziqulathiweyo?
5. Umatshini wenza izikrufu ezili-1,200 ngeyure ezintandathu, uyakuthatha ixesha elingakanani umatshini ukwenza izikrufu ezili-10,000?
6. Ukuba umntu unokuhlala eNew York iintsuku ezili-10 nge- $ 650. Zingaphi iintsuku onokufikelela kuzo xa uneedola ezingama-500 kuphela?
7. Ngeelitha ezi-5 zepeyinti, zi-90 m zocingo eziipeyintiweyo. Bala ukuba zingaphi iimitha zocingo ezinokupeyintwa ngeelitha ezingama-30.
8. Iimpompo ezintathu zithatha iiyure ezili-10 ukugcwalisa itanki lamanzi. Iyakuthatha iiyure ezingaphi ukwenza loo nto?
9. Ukuba kufuneka ndihlwayele iimbewu ezingama-30 kumqolo ngamnye, zingaphi iimbewu endizakuzidinga ukutyala ibhetshi enemiqolo engama-20?
10. Ukuba kwisithuba seeyure ezimbini ezinesiqingatha umqhubi wesithuthuthu uye wagubungela umgama oziikhilomitha ezingama-320. Ngaba udlulile kwisantya esilinganiselweyo, esiyi-80 km / h?

Iimpawu

Indlela yokusombulula into engaziwayo kakhulu ilula kwaye kulula ukuyinkqayaNgapha koko, sesinye sezizathu zokuqala zokuba abantwana bafundiswe ngexesha lesikolo saseprayimari, apho baqala khona ukuphatha imisebenzi esisiseko (ukongeza, ukuthabatha, ukuphinda-phinda nokwahlulahlula).

Ukuba idatha yolwalamano oluqinisekileyo eyaziwayo ichaziwe apha ngasentla, nangaphantsi nakwikholamu, idatha eyaziwayo yolunye uthotho iqatshelwe kwelinye icala (ngokubanzi kwindibano ngasekhohlo).

Okungaziwayo kuya kubangelwa kukuphindaphinda amaxabiso amabini awaziwayo afunyenwe edibene, C x B, kunye nokwahlula loo mveliso ngexabiso elisele elaziwayo, oko kukuthi, A; kungoko ixabiso elingaziwayo D.

Umsebenzi womgca kumlawuli

Inkcazo yemathematika yomgaqo olula wesithathu ucinga ukuba ubukho bomsebenzi olayini odibanisa izinto ezimbini eziguquguqukayo.

Kuyenzeka ukuba umsebenzi ohambelana nomgaqo yenye yezona zilula ukuwuqonda nokubona, kuba ukumisela konke ukusebenza kwawo kwanele ukwazi amanqaku amabini awela ngawo loo mgca okanye umgca: uphawu olulinganayo lwenza ukuba umkhondo uhlale ufana, uzingise kwicala elibi kunye nokungenasiphelo okuqinisekileyo.

Ke ngoko, ukuncitshiswa emva Umgaqo olula wesithathu ukuvumela ukuba uwazi ngokupheleleyo umsebenzi obhekisa kuwo: i-quotient phakathi kokuthabatha kokubini eziguquguqukayo (kwimeko esiyibonileyo, isiphumo se (DB) esahlulwe (CA) sisithambeka, oko kukuthi, kungakanani umahluko oqulethe u-D no-B ukuqhubela phambili xa lowo uqhubela phambili iyunithi enye iqulethe C no-A.

Qaphela oko kwezinye iimeko idomeyini ithintelwe, kuba izinto ezinjengexesha elingalunganga (-10 iiyure) okanye inani elingadibaniyo le-screws okanye iimoto azinakubakho.

Ulungelelwaniso olungqalileyo nolungafaniyo

Ngaphakathi komgaqo olula wesithathu, kubalulekile ukwahlula phakathi kokulingana ngokuthe ngqo kunye nokulingana okungafaniyo: okokugqibela kwenzeka xa ubudlelwane endaweni yokuba nethemba (njengoko kuchaziwe) Ngu-negative, ngomgca kwicala elichaseneyo, kwaye xa uguquko olunye luhamba ngendlela ethile enye iya kwelinye icala.

Ukuba kuyatshiwo, umzekelo, ukuba abasebenzi aba-2 (ixabiso elaziwayo, A) bathatha iiyure ezi-6 ukwenza udonga (ixabiso elaziwayo, B), kunye nomlinganiswa olinganayo othembekileyo, abasebenzi aba-4 (ixabiso elaziwayo, C) abayi kuthatha i-12 iiyure ukwakha olo donga, kodwa ngokuchaseneyo, iiyure ezi-3 (ixabiso elingaziwayo, D).

Eli nani livela ngokwenza kule meko yokulinganisa okungafaniyo A x B / C (endaweni ye-B x C / A), yile nto yaphakanyiswa ngaphambili ukuba ilingane ngokuthe ngqo.

Into ebalulekileyo kukuba ulungelelwaniso, nokuba luthe ngqo okanye aluchanekanga, alusebenzi kuwo onke amatyala, kuba ayingabo bonke ubudlelwane bemathematika abalandela le patheni yomgca.

Ubuninzi bobudlelwane bendalo kunye noluntu ekuhlaleni bunxaxhile kule patheni, kubenza kube nzima kakhulu ukusondela kunye nokuqikelela.