x-1 | x+6
x-1 | x-1
Le scadem
x-1 | 7
x-1={7,-7,1,-1}
x={8, -6, 2, 0}
Suma elementelor=8-6+2+0=4
Raspuns: A) 4
Răspuns: Varianta corectă → d)
Explicație:
[tex]\bf x - 1 ~~\big|~~ x + 6[/tex]
[tex]\bf \underline{x - 1 ~~\big|~~ x -1~~~~~~~}~_{\bf (-)}[/tex]
[tex]\bf x-1~~\big |~~ 7\implies x-1 \in D_{7}[/tex]
[tex]\bf x-1 \in \{-7;-1;1;7\}~~~\bigg|_{+1}[/tex]
[tex]\bf x \in \{-6;0;2;8\}[/tex]
Suma elementelor A = -6 + 0 + 2 + 8
Suma elementelor A = 4
Varianta corectă → d)