Question

(15-x)•2=2x+14
(3x+4)•5mai mare sau egal cu 30

Answer 1

Răspuns:

Explicație pas cu pas:

(15-x)•2=2x+14  <=> 30-2x = 2x+14 <=>

2x +2x = 30-14 <=>  4x = 16 => x = 16:4 => x = 4

(3x+4)·5 ≥ 30 <=> 15x+20 ≥30 <=> 15x ≥30-20 <=>

15x ≥ 10 => x  ≥ 10/15 <=> x ≥ 2/3  => x ∈ [2/3 ; +∞)