cautam numerele k, a.i.
k:21= cat , rest 9
220:21=10, rest 10
=> cel mai mic k= 220+(21-10)+9=240
240:21=11, rest 9
gasim cel mai mare numar:
430:21=20 rest 10 => k=429:21=20 rest 9
=> k={240,361,...429}={11*21,12*21,...20*21}
Cate sunt ?
20-11+1=10 numere maturale
cuprinse intre 220 si 430 impartite la 21 dau restul 9
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