I kwesamba inani eliyisilinganiso - kuyini kanti ibalwa kanjani?

Esikhathini inqubo yokufunda wezibalo abafundi bajwayelane umqondo emkhakheni we-arithmetic ukuthini. Kamuva ezibalweni nezinye abafundi isayensi nobuso nabanye nge ukubala ka ezomhlaba. Njengoba kungase kube nzima, futhi ihluke nomunye?

Amanani esijwayelekile: inshokutsi umehluko

It is hhayi njalo izinkomba olunembile inikeze ukuqonda isimo. Ukuze ukuhlola isimo esithile, kubalulekile ngezinye izikhathi ahlaziye omningi izinombolo. Futhi ke eze ezomhlaba usizo. Bavumela ukuyohlola bebonke.

Kusukela esikoleni, abadala abaningi ukukhumbula khona izibalo kusho. Kulula kabi ukuba abale - isamba ukulandelana n imigomo lihlukaniswe by n. Okusho ukuthi, uma kubalulekile ukubala kusho izibalo of ukulandelana yamanani 27, 22, 34 kanye no 37, kubalulekile ukunquma inkulumo ethi (27 + 22 + 34 + 37) / 4, njengoba kungenzeka amanani 4 lisetshenziswe izibalo. Kulokhu, ukubaluleka target uyalingana 30.

Ngokuvamile ngonyaka esikoleni futhi batadishe weJiyomethri kusho. Ukubala yalesi value kusekelwe isizinda impande n-hydrochloric lomkhiqizo n-amalungu. Uma sithatha izinombolo ezifanayo: 27, 22, 34 no-37, umphumela ukubala ilingana 29,4.

I harmonic anonya esikoleni samabanga aphakeme ngokuvamile akusona isihloko zokutadisha. Noma kunjalo, sivamile ukusetshenziswa ngempela. Lokhu value iyona ephambene arithmetic Kusho futhi esibaliwe quotient n - inombolo yamanani futhi isibalo _1/1 + _1/2 + ... +1 / a _n. Uma namanje ukuthatha okufanayo iqoqo izinombolo sokubalwa, okuqukethwe harmonic of 29,6.

kwesamba: izici

Nokho, kuzo zonke lezi izinto eziningi ngeke likwazi ukusebenziseka kwi yonke indawo. Ngokwesibonelo, kwezinye izibalo kulesi sibalo amagugu isilinganiso indima ebalulekile "isisindo" inombolo ngayinye kusetshenziswa izibalo. Imiphumela Indlela kakhudlwana futhi esemthethweni njengoba uvumele ukuze uthole olunye ulwazi. Leli qembu lokwehlukile yigama jikelele "kwesamba". Abayi esikoleni, ngakho kuyafaneleka ukuba ngifuna kabanzi.

Okokuqala, kufanele akutshele ukuthi yini ukuthini "isisindo" lwenani ethile. Indlela elula ukuchaza lesi isibonelo ukhonkolo. Kabili ngosuku esibhedlela kukhona lokushisa lomzimba kulinganiswa ezingafani esigulini ngasinye. Iziguli 100 eminyangweni ehlukahlukene esibhedlela 44 kuyoba lokushisa evamile - 36,6 degrees. Kwenye 30 izokwenyuka value - 37,2, 14 - 38, 7 - 38.5, kusukela 3 - 39, kanye asele amabili - 40. Futhi uma uthatha arithmetic kusho, lesi silinganiso ngokuvamile esibhedlela kuyoba ezingaphezu kuka-38 degrees! Kodwa cishe kwesigamu iziguli ngokuphelele lokushisa evamile. Futhi lapha ukuthi ilungile ngaphezulu ukusebenzisa kwesamba value isilinganiso, kanye "isisindo" we variable ngayinye isibalo sabantu. Kulokhu, umphumela sibalo kuyoba 37,25 degrees. Umehluko isobala.

Endabeni le kwesamba izibalo elivamile "isisindo" kungenzeka inani izimpahla ezenziwe, inani labasebenzi osukwini olunikeziwe, abantu, ngokuvamile, yini kungenziwa alinganiswe futhi nomthelela umphumela wokugcina.

zinhlobo

I kwesamba ukubaluleka ovamile kuhlobene nezinga izibalo kusho esisanda kuxoxa ngazo kulesi sihloko. Nokho, ukubaluleka lokuqala, njengoba kuye kwashiwo, futhi uyakucabangela isisindo inombolo ngayinye kusetshenziswa izibalo. Ngaphezu kwalokho kukhona okuthile okusindayo ukuze amagugu Jomethri nalabo harmonic.

Kunenye ezihlukahlukene ezithakazelisayo asetshenziswe uchungechunge lwezinombolo. It is mayelana isisindo ezihambayo isilinganiso. Lokho Amathrendi kubalwa ngesisekelo yalo. Ngaphezu amagugu ngokwabo kanye isisindo sabo futhi lisetshenziswa imvamisa. Futhi kulesi sibalo inani eliyisilinganiso esikhathini esithile ngesikhathi ibuye kunakwe inani lo odlule zinkathi.

Ukubala letindlela tekuphila akuyona yisixakaxaka, kodwa umkhuba ngokuvamile isetshenziswa ezivamile kuphela kwesamba.

Izindlela sibalo

Kule nkathi of computerization kudlangile Akubalulekile ukubala kwesamba ngesandla. Nokho, kuyasiza ukwazi ifomula kuhlaziywa ukuthi kungenzeka ukuba uhlole futhi ulungise imiphumela njengoba kudingeka.

Indlela elula kungaba ukucabangela ekubalweni isibonelo esikhethekile.

Kuyadingeka ukuthola ukuthi kunani komholo ngesikhathi isitshalo ngokuphathelene inani lezisebenzi ethola bazuze imadlana ethile.

Ngakho, kwesamba ukubala isilinganiso yenziwa ngokusebenzisa le ifomula:

x = (a ₁ * w ₁ + ₂ * w _{2 + ... + a * n w n} ) / (w ₁ + w ₂ + ... + w _n)

Ngokwesibonelo, ukubala kungaba:

x = (32 * 20 + 33 * 35 + 34 * 14 + 40 * 6) / (20 + 35 + 14 + 6) = (640 + 1155 + 476 + 240) / 75 = 33,48

Ngokusobala, kukhona nobunzima kakhulu ukuze ngesandla ukubala kwesamba. Ifomula kuhlaziywa lesi silinganiso kwelinye izicelo ethandwa kakhulu amafomula - Excel - ifana SUMPRODUCT umsebenzi (uchungechunge lwezinombolo, iqoqo izinsimbi) / ISAMBA (inani izikali).