Question

Sa se determine x apartine Z pt care 7 supra x+3 apartine lui Z

Answer 1

X+3|7 D(7)={-7,-1,1,7} 1. X+3=-7 X=-7-3=-10 2. X+3=-1 X=-1-3=-4 3. X+3=1 X=1-3=-2 4. X+3=7 X=7-3=4

Answer 2

$\frac{7}{x+3}$ de unde x+3 E $D_{7}$
xE{-4,-2,-3,4,-10}