Question

Determinati elementele multimilor:
C={x € Z / 3 supra x-1 € Z}.
D={x € Z / -5 supra 4-x € Z}.

Va roog ma ajutati? ​

Answer 1

Explicație pas cu pas:

3/x-1€Z <=> x-1€D3 in Z =>x-1€{-3,-1,1,3} =>

x€{-2,0,2,4}

-5/4-x€Z <=> 4-x€D -5 in Z =>

4-x€{-5,-1,1,5} => x€{9,5,3,-1}