Question

URGENTa) 7 supra x-2 b)10 supra 3-x c) -1 supra 2x-5 d) x+1 supra x-1 sa fie intregi MULTUMESC !!!

Answer 1

x-2 apartine D7 => x-2 apartine {-7,-1,1,7}  /+2
   x apartine {-5,1,3,9}
3-x apartine D10 => 3-X apartine {-10,-5,-2,-1,1,2,5,10}  /-3
-x apartine{-13,-8,-5,-4,-2,-1,2,7 } /  (-1)
x apartine{ 13,8,5,4,2,1,-2,-7 }
2x-5 apartine {-1,1} /+5
2x apartine {4,6} /  :2
x apartine {2,3}
si ultima
(x-1)I(x+1) si(x-1)I(x -1) deci x-1 divide si diferenta lor , adica x-1 I x+1-x+1;
x-1I 2 => X-1 apartine D2 x-1 apartine {-2 -1,1,2} /+1
x apartine { -1,0,2,3}