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AJUTORRRRRRRRRRRRRRRRRRRRRRRRRRRRRR!!!!!!! ​

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Răspuns :

Răspuns:

...de 9

Explicație pas cu pas:

100a+10b+c =5(10a+b+10a+c)

100a+10b+c=100a+5b+5c

5b=4c

cum b si c sunt cifre iar 5 si 4 sunt prime intrwe ele

b=4 , c=5

a∈{1;2;...9}....deci 9 numere

cum b si c pot permuta in paranteza,  avem 9+9=18