Question

Fie A={ x e N|2x+1<9} si B={x e N|7<3x+2<18} Determinati multimile A si B.​

Answer 1

A=2x+1<9 A={1,2,3}

2x<9-1

2x<8

x<4

B=7<3x+2<18 B={2,3,4,5}

7-2<3x<18-2

5<3x<16