Question

Cate numere naturale de forma a4b se impart exact la 5?

Answer 1

Răspuns:

140,145,240,245,340,345,440,445,540,545,640,

645,740,745,840,845,940,945,040,045

adică sunt 20 de numere naturale

Answer 2

5|a4b=>b€{0,5}

Pt. b=0=>a{1,2,3,...,9}~9nr}

Pt. b=5=>a{1,2,3,...,9}~9nr}

=>9+9=18 nr

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