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Fie A = { 1, √5, -√16, -4 supra 3, √0,4, 0, √1003. Determinați mulțimile:
a) A n Z
b) A n Q
c) A \ N
d) N n A
e) A u R
f) A \ (R-Q)
g) A \ R
h) A n R
i) A \ Z
j) A n (R \ Q)

Răspuns :

Cristinacantau
In primul rand
N-nr naturale(1,2,3...123...)
Z- nr intregi(...-3,-2,-1,0,1,2,....345...)
Q-nr rationale (-2/3,-1/3,-3/2;1,3;5; 2,4; -7...)
R nr reale ( toate nr incluziv √)
a) 1;4;0;-√16(=-4); √0
b)1;-√16;-4/3;√0;4;0;
c)√5;-4/3;√1003;√16;√0
......

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