Question

__ __
bc-cb=27
Afla nr​

Answer 1

Răspuns:

bc numar∈{51,62,73,84}

Explicație pas cu pas:

10b+c-10c-b=27

9(b-c)=27

b-c=4

b si c , cifre nenule b>c

b=c+4

bc numar∈{51,62,73,84}

Answer 2

$\it \overline{bc}-\overline{cb}=27 \Rightarrow 10b+c-10c-b=27 \Rightarrow 9b-9c=27|_{:9} \Rightarrow b-c=3 \Rightarrow \\ \\ \Rightarrow \overline{bc}\in\{96,\ \ 85,\ \ 74,\ \ 63,\ \ 52,\ \ 41\}$