Question

Ce numere se includ in multimile: Q,N,Z,R,I
radicalii si numerele cu virgula, in care se includ(dintre acestea)?

Answer 1

N⊂Z⊂Q⊂R.

$N=\{0;1;2;3;4...\} \\ Z=\{\pm x/~x \in N \} \\ Q= \{\frac{x}{y} / x,y \in Z;~(z;y)=1 \} \\ R=Q~(reunit)~(R-Q) \\ R-Q=numerele~care~au~o~infinitate~de~cifre~fara~perioada~dupa \\ virgula.$