maTematika 7

4. cxadia gaiyofa, I Tvisebis Tanaxmad 18=2·9.5. iyofa I Tvisebis Tanaxmad.6. a) ori momdevno naturluri ricxvidan erTi luwia.b) sam momdevno naturalur ricxvSi erTi samis jeradi, xolo erTi mainc _ luwi.7. a) 288+38+351+953cxadia iyofa 2-ze l+l+k+k=l.3-ze ar iyofa, CavataroT Semdegi msjeloba 2883 3513, xolo 38 da 953-is cifrTa jamiar iyofa 3-ze.5-ze gayofadoba SevamowmoT bolo cifrebis jamiT 8+8+1+3. bolo cifria 0. e.i. 5-zeiyofa.7-ze gayofadoba naSTebiT288=7·41+138=7·5+3351=7·50+1953=7·133+2naSTebis jamia 7. e.i. jami 7-ze iyofa.8. a) 5·10 5 +3·10 3 +2·10 2 +10ricxvi 0-iT bolovdeba, e.i. iyofa 5-ze da 10-ze.5+3+2+1 3, e.i. ricxvi 3-ze ar iyofa.bolo ori cifrisgan Sedgenili ricxvia 10, e.i. 4-ze ar iyofa.9. daamtkiceT, rom a) (258 2 -33·51+47 2 )10; b) (123 2 -62 2 )5.a) viciT, ricxvi rom 10-ze iyofodes, unda bolovdebodes 0-iT. 258 2 -is bolo cifria4, 47 2 -is bolo cifria 9, e.i. 258 2 +47 2 bolovdeba (4+9=13) 3-iT. 33·51 bolovdeba 3-iT, e.i.sxvaobis bolo cifria 0.b) ricxvi rom iyofodes 5-ze, unda bolovdebodes 0-iT an 5-iT. 123 2 –62 2 =...9-...4=...5, e.i.iyofa 5-ze.10. varskvlavebis nacvlDad CasviT cifrebi ise, rom Sesruldes:a) *378*36; b) 4*2545; g) 2894*6; d) 56**18.a) ricxvi rom 36-ze iyofodes, unda iyofodes 4-ze da 9-ze.4-ze gayofisTvis aRniSnuli ricxvis bolo cifri unda iyos 0; 4 an 8;*3780 9-ze rom iyofodes (3+7+8=18) varskvlavis nacvlad unda iyos 9. 93780.*3784 9-ze rom iyofodes (3+7+8+4=22) * nacvlad unda eweros 5(27-22=5). e.i. 53784.*3788 9-ze rom iyofodes (3+7+8+8=26) * nacvlad unda iyos 1. 13788.b) ricxvi rom 45-ze iyofodes, unda iyofodes 5-ze da 9-ze. mocemuli ricxvi 5-ze iyofa.cifrTa jamia 4+2+5=11 Casasmeli ricxvia 7. 4725.g) ricxvi rom 6-ze iyofodes, unda iyofodes 2-ze da 3-ze. 2+8+9+5=24 e.i. boloSi undamieweros iseTi luwi cifri, romelic iyofa 3-ze, aseTebia: 5670; 5688; 5616; 5634; 5652.11. daamtkiceT a) 2344 2 -1 iyofa 5-ze; b) 3789 2 -1 iyofa 10-ze.a) 2344 2 bolovdeba 6-iT, amitom 2344 2 -1 dabolovdeba 5-iT.b) 3789 2 bolovdeba 1-iT, amitom 3789 2 -1 dabolovdeba 0-iT.33masc_cigni_VII_kl_cor.indd 33 03.07.2012 15:46:28