Question

va rog dau coroană pliss​

Answer 1

Răspuns:

Explicație pas cu pas:

numerele sunt divizibile cu 3 => suma cifrelor este divizibila cu 3:

a)

$(4+3+x) \ \vdots \ 3 \iff (x+7) \ \vdots \ 3 \implies x \in \{2;5;8\}$

b)

$(5+x+3) \ \vdots \ 3 \iff (x+8) \ \vdots \ 3 \implies x \in \{1;4;7\}$

c)

$(7+2+x) \ \vdots \ 3 \iff (x+9) \ \vdots \ 3 \iff x \ \vdots \ 3 \implies x \in \{0;3;6;9\}$

d)

$(6+x+2+5) \ \vdots \ 3 \iff (x+13) \ \vdots \ 3 \iff \implies x \in \{2;5;8\}$

e)

$(7+x+5+2) \ \vdots \ 3 \iff (x+14) \ \vdots \ 3 \iff \implies x \in \{1;4;7\}$

f)

$(8+5+x+2) \ \vdots \ 3 \iff (x+15) \ \vdots \ 3 \iff x \ \vdots \ 3 \implies x \in \{0;3;6;9\}$