Răspuns:
x-1 divide 8
D₈=1,2,4,8
x-1=1=>x=1+1=>x=2
x-1=2=>x=3
x-1=4=>x=5
x-1=8=>x=9
nr naturale care indeplinesc conditia data sunt: 2,3,5,9
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2x-1 divide 35
D₃₅= 1,5,7,35
2x-1=1=>2x=1+1=>x=2:2=>x=1
2x-1=5=>2x=5+1=>x=3
2x-1=7=>2x=7+1=>x=4
2x-1=35=>2x=35+1=>x=18
nr naturale care indeplinesc conditia data sunt: 1,3,4,18
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3x+2 divide 65
D₆₅=1,5,13,65
3x+2=5=>3x=3=>x=1
3x+2=65=>x=21
nr naturale care indeplinesc conditia data sunt:1,21
