Question

Rezolvați sistemul de inecuații.
$2(x - 1) \leqslant 7(x +1)$
$3(x \times 2) > 5( x - 1)$
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Answer 1

Răspuns:

2 (x - 1) ≤ 7 (x + 1)

2x - 2 ≤ 7x + 7

2x - 7x ≤ 2 + 7

-5x ≤ 9 / ÷(-1) -› 5x ≥ -9

x ≤ - 9 / 5

x ≤ [- 9 / 5; +∞)

3 (x × 2) > 5 (x - 1)

3x × 6 > 5x - 5

18x > 5x - 5

18x - 5x > - 5

13x > - 5 -› x > - 5 / 13

x > ( - 5 / 13; +∞)