Question

Numere de forma: a7cu bara deasupra
7a cu bara deasupra
Multumesc

Answer 1

a difert de 0
a={1. 2. 3. 4. 5. 6. 7 .8 .9. }
a7 bara sus ={17. 27. 37 47 57 67 77 87 97 }
Sper ca te.am ajutat !Coronita?

Answer 2

$nr. \: de \: forma \: \overline{a7} \: sunt \: :17,27,37,47,57,67,77,87,97.$

$= > a \: \epsilon \: \begin{Bmatrix} 1,2,3,4,5,6,7,8,9 \end{Bmatrix}$

$nr. \: de \: forma \: \overline{7a} \: sunt \: :70,71,72,73,74,75,76,77, 78,79.$

$= > a \: \epsilon \: \begin{Bmatrix} 0,1,2,3,4,5,6,7,8,9 \end{Bmatrix}$