Question

Determinați nr. naturale X . știind că:

a)7·x·3≤5·x+13
b)2·x+4<x+16

Answer 1

a)7·x-3≤5·x+13
7x-5x≤13+3
21x-5x≤13
16x≤16
x≤16/16
x≤1
x=0,1

b)2·x+4<x+16
2x-x<16-4
x<12
x∈{0,1,2,3,4,5,6,7,8,9,10,11}