Question

Rezolvati inecuatiile:
a.25-x mai mare sau egal decat x +13,x apartine lui N
b.|x-4| <3,x apartine lui Z

Answer 1

25-x >= x+13 | -x
25- 2*x >= 13
2*x>=25-13
2*x>=12
x>=6      N(6,7,8,9,10 etc)

x-4<3
x<3+4
x<7      Z(0,1,2,3,4,5,6)