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Xisaabta, thiin tirsiimo ama thiin dabiici ama tiro tirsiimo ama marmar loogu yeero Tiro idil waa tiro kasta oo abyoone Togan ah 1.2.3...12.765, qaar ka mid ah xeeldheerayaasha xisaabta waxay ku kordhiyaan eberta, waxaana loo suntaa xarafka (N) sida la isku raacsanyahay eber kamid maaha tiro tirsiimada, waa urur tirabeel ah oo aan dhamaanayn waligeed waxaana ugu yar 1.
Oodanaanshaha tiro tirsiimo, haddii aynu isgeyno laba tiro tirssimo wadartoodu waxay noqonaysaa tiro tirsiimo kale.
Tusaale
8 oo ah wadarta tirooyinka 5 iyo 3 waa tiri tirsiimo.
Haddii tirooyinka tirsiimo laysu geeyo wadartoodu waa tiro tirsiimo kale.
Sisaa awgeed ururka tiro tirsiimo waa ku oodmaa isugeygta.
Oodan lahaanshaha isugeynta Haddii a iyo b yihiin tiriiyinka ku jira ururka tirsiimo markaa a+b waa tiro ku jirta ururka laftiisa. Haddii aynu qaadano xisaabfal kala goynta, meeshii isugeynta waxaynu ogaaneynaa in kala goynt aaney oodin uruka tirsiimo. Sida 9 - 9 = 0 iyadoo aan 0 ahayn tiro tirsiimo.
Summadaha loo adeegsado
45 waa 32·5.
Tsaale:
11 = 11
25 = 5 × 5 = 52
125 = 5 × 5 × 5 = 53
360 = 2 × 2 × 2 × 3 × 3 × 5 = 23 × 32 × 5
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