Question

Va rog repede.......​

Answer 1

-4/x+1 ∈ Z ⇒ x+1∈ $D_4$

x+1 ∈ {-1,1,-2,2,-4,4}/-1

x∈{-2,0,-3,1,-5,3}

______________________

-7/2x+1 ∈ Z ⇒ 2x+1 ∈  $D_7$

2x+1 ∈ {-1,1,-7,7}/-1

2x ∈ {-2,0,-8,6}/:2

x ∈ {-1,0,-4,3}

______________________

2x+1/x+2 ∈ Z ⇒ x+2|2x+1

x+2|2x+1⇒x+2|2(x+2)

x+2|x+2⇒x+2|2x+4

x+2|2x+4-2x-1⇒x+2|3⇒x+2∈ $D_3$

x+2∈{-1,1,-3,3}/-2 ⇒ x∈{-3,-1,-5,1}