Ukuze siqonde ukuthi yiziphi izinombolo eziphozithivu nezinegethivu, ake siqale sidwebe umugqa wokuxhumanisa bese simaka iphuzu elithi 0 (zero) kuwo, okubhekwa njengemvelaphi.
Masihlele i-eksisi ngendlela ejwayelekile evundlile. Umcibisholo ubonisa isiqondiso esihle somugqa oqondile (kusuka kwesokunxele kuye kwesokudla).
Masiqaphele ngokushesha ukuthi inombolo ethi "zero" ayisebenzi ezinombolweni eziphozithivu noma ezinegethivu.
izinombolo eziphozithivu
Uma siqala ukulinganisa amasegimenti kwesokudla sikaziro, khona-ke amamaki aphumayo azohambisana nezinombolo eziphozithivu ezilingana nebanga elisuka ku-0 ukuya kulawa maphuzu. Ngakho sithole i-eksisi yezinombolo.
Incazelo ephelele yezinombolo eziphozithivu ihlanganisa uphawu oluthi “+” ngaphambili, okungukuthi, +3, +7, +12, +21, njll. Kodwa elithi “plus” ngokuvamile liyashiywa futhi lishiwo kalula:
- U-“+3” uyafana nokuthi “3”
- +7 = 7
- +12 = 12
- +21 = 21
Qaphela: noma iyiphi inombolo ephozithivu enkulu kunoziro.
Izinombolo ezingezinhle
Uma siqala ukulinganisa amasegimenti ngakwesobunxele sika-zero, esikhundleni sezinombolo eziphozithivu, sizothola izinombolo ezinegethivu, ngoba sizohamba siye kolunye uhlangothi lomugqa oqondile.
Izinombolo ezinegethivu zibhalwa ngokungeza uphawu lokususa ngaphambili, olungalokothi lushiywe: -2, -5, -8, -19, njll.
Qaphela: noma iyiphi inombolo enegethivu ngaphansi kukaziro.
Izinombolo ezingezinhle, njengeziphozithivu, ziyadingeka ukuveza amanani ahlukahlukene ezibalo, ezomzimba, ezomnotho nezinye. Ngokwesibonelo:
- izinga lokushisa lomoya (-15 °, +20 °);
- ukulahlekelwa noma inzuzo (ama-ruble ayizinkulungwane ezingama-240, ama-ruble ayizinkulungwane ezingama-370);
- ukwehla okuphelele/okuhlobene noma ukwanda kwenkomba ethile (-13%, + 27%), njll.