Question

aflati multimile A={X€N|2x+4<= (nu am semnul cu mai mic sau egal asa ca am pus <= ) 12
si B={Y€N|2³ < 3x(3 la puterea x) <2⁷​

Answer 1

Răspuns:

A={x€N|2x+4 <=12

x€N => x€{0,1,2,3.......}

2x + 4 <= 12

2x <= 12 - 4

2x <= 8

x<= 8 : 2

x<= 4

x = {0,1,2,3,4}

A={0,1,2,3,4}

B={y€N | 2/3(2 la puterea a treia)<3/x(3 la puterea x )<2

x€N => x€ {0,1,2,3,4........}

2/3 = 6<3/x <2

3/x €{3/0} => x ={1}

B ={1}