Question

sa se det multimea A={x€Z,6/x+1 €Z}​

Answer 1

Răspuns:

6/(x+1)€Z rezultă că x+1€D6

D6={1,2,3,6,-1,-2,-3,-6}

x+1€{1,2,3,6,-1,-2,-3,-6}

x+1=1 ,x=1-1, x=0

x+1=2,x=2-1, x=1

x+1=3,x=3-1, x=2

x+1=6,x=6-1, x=5

x+1= -1, x= -1-1, x= -2

x+1= -2, x= -2-1, x= -3

x+1= -3, x= -3-1, x= -4

x+1= -6, x= -6-1, x= -7

A={0,1,2,5,-2,-3,-4,-7}