Question

Determinati cardinalul multimilor in cazurile​

Answer 1

A = {2, 3, 4, 5, 6, 7}

-7 </ 2x-1 </ 7 aduni tot cu 1

-6 </ 2x </ 8 imparti tot cu 2

-3 </ x </ 4

B = {-3, -2, -1, 0, 1, 2, 3, 4}

-4 </ x+1 </ 4 scazi tot cu 1

-5 </ x </ 3

C = {-5, -4, -3, -2, -1, 1, 2, 3}

-2 < (x-9)/2 < 2 amplifici cu 2 numerele -2 si 2

-4 < x-9 < 4 aduni tot cu 9

5 < x < 13

D = {6, 7, 8, 9, 10, 11, 12}