Question

Ex 2 plss

10 puncte plus coroană​

Answer 1

Răspuns:

A={n€N*|0<_n+1<5}

n=1,2,3,4

n+1=>1+1=2

2+1=3

3+1=4

4+1=5

A={2,3,4,5}

B={x|x€N si 13 <x²-1<_99}

x=4,5,6,7,8,9

B={456789}