Leḥsab n sqef n uɛeqqa
Ttxil-k sken-d lqidar ilaqen. deg yimilimitren
X - Tehri n uxxam
Y - Lqedd n sqef
C - Tajumma n uɛeṭṭel
B - Teɣzi n sqef
Y2 - Taɣzi n zyada
X2 - Tihri n zyada
amnir
Ahil-a yettwaxdem i leḥsab n ttawilat n lebni n sqef.: Tajumma n ttawil n tewlaft (ondulin, nulin, slate neɣ tiles n wuzzal), ttawil n usqif (glassine, lfeṭṭa n sqef), n tfelwiyin n tfelwiyin d tfelwiyin n tfelwiyin.
Tzemreḍ daɣen ad tḥesbeḍ kra n tɣawsiwin n sqef yesɛan nnfeɛ.
Ahil ixeddem s snat n tɣawsiwin: sqef n tmeẓdiyin tifrarayin d sqef s snat n tmeẓdiyin n yidis (Ssqef n yidis), ṣṣenf1 d ṣṣenf2.
Afad! Ma tesɛiḍ sqef s yiwen n usqif n yidis, sseqdec ṣṣenf 1 i leḥsabat uqbel, syen ṣṣenf 2. Yerna seg yisefka ay d-yettwafernen, ḥessben azal n tɣawsiwin n lebni : tifelwiyin, tifelwiyin n usqerdec, ttawilat n usqif d tɣawsiwin n tfelwit.
Ma ulac yezmer ad yili tuccḍa deg leḥsab. Akken yebɣu yili, ahil-a yettḥessis-d iɣezran yellan deg tqacuct tameqrant i tqacucin n tɣawsiwin n tlemmast.
Deg lḥisab ad twaliḍ aṭas n yiḍrisen : lqidar neɣ lqidar n tɣawsa n lebni n uzgen n sqef yerna deg tfelwiyin - lqidar neɣ lqidar akk.
Deg uḥric n sqef n tmerna - lqidar d lqidar akk, yerna deg tfelwiyin llan sin n yiḍrisen : lqidar d lqidar n yiwen d sin n sqef n tmerna.
Afad! Mi ara tḥesbeḍ lḥaǧa n usqif n tfelwit, ḥrez deg wallaɣ-ik belli ahil yettḥessis s tfekka n usqif.
Amedya, 2,8 n tfelwiyin s 7,7 n tfelwiyin deg yal tafelwit. Deg tallit n lebni n tidet, ttwasersen 3 n yiḍarren.
Akken ad tḥesbeḍ s tɣawla ugar amḍan n tfelwiyin n sqef, yessefk ad tesneqseḍ lqedd n tfelwiyin deg uḥess alamma d asmi ara d-tafeḍ amḍan n tfelwiyin s lekmal-nsent.
Ur tettut ara ad tesbeddeḍ azal n tmeẓẓuɣt s tɣawla ugar.
Mi ara nḥess lqidar n tɣawsa i tmeẓdiyin n sqef ameqqran, deg tegnit n ṣṣenf wis 2, ahil ur yettḥessis ara i tgezzayt i tmeẓdiyin n yidis. Aya d sebba n kra n wuguren n usnefli deg wahil.
Ahat ad fruɣ aya ɣer sdat.
Maca, lḥaǧa n rraf i d-yeqqimen ur tezmir ara ad teffeɣ, neɣ ad tgeḍ kra n tɣawsiwin deg leḥsabat-ik.
Ad d-yili daɣen wahil yemgerraden i lmend n uḥezzeb s tmussni ugar n tɣawsiwin n tmeẓdiyin n tfelwit.
Yerna ur tettut ara belli ilaq ad tessenzeḍ lḥerǧ n lebni s kra n tḥeqranit i lbaṭel.