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gasiti nr nat pare de forma ab stiind ca ab+ba=4a+4b+56
repede
pls pls pls



Răspuns :

ab+ba=4a+4b+56, a si b cifre diferite de zero

10a+b+10b+a-4a-4b=56

7a+7b=56

a+b=8

a=1, b=7
a=2, b=6
...
...
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a=7, b=1

Nr. sunt: 17,26,35,44,53,62,71