Question

giải bất phương trình
a)2x+1/2x+2<1
b)1/x+4<1/x-2

Answer 1

Answer:

$a)x < - \frac{2}{5}$

$b)4 < - 2$

Step-by-step explanation:

$a)2x + \frac{1}{2} x + 2 < 1$

$= 4x + x + 4 < 2$

$= 5x + 4 < 2$

$= 5x < 2 - 4$

$= 5x < - 2$

$= x < - \frac{2}{5}$

$= x < - 0.4 \times ∈( - \infty . - \frac{2}{5} )$

$b) \frac{1}{x} + 4 < \frac{1}{x} - 2$

$= \frac{1}{x} + 4 < \frac{1}{x} - 2.x≠0$

$= 4 < - 2$

= X ∈ ∅