Question

(a+2) | (2a +19 )
aflati a

Answer 1

Răspuns

(a+2)l(2a+19)=>(a+2)l[(2a+4)+15]

(a+2)l[2(a+2+15]

Dar   (a+2)l2(a+2)=>(a+2)l15

D15={1,3,5,15}

a+2=1 nu     admite    solutii

a+2=3=>a=3-2=1

a+2=5=> a=5-2=3

a+2=15 a=15-2=13

a={1,3,13}

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