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Rezolvati in multimea numerelor naturale inecuatiile:
a)2x+3≥11;
b)x:4+2<5;
c)4x-6≤2;
d)3 la puterea x≤3 la puterea 5.


Răspuns :

a) 2x+3≥11|-3
2x≥8/:2
x≥4
b) x:4+2<5
x:4<3
x<12
c) 4x-6≤2
4x≤8
x≤2
d) 3 la x≤3 la 5
x=0,1,2,3,4,5