Question

Реши Реши что на фотке

Answer 1

2.

$- 7x < 15 = x = 15 \div ( - 7) = x > - 15 \div 7 = x > \frac{ - 15}{7}$

$5x > 40 = x > 40 \div 5 = x > 8$

$- 2x < - 3 = x > 3 \div 2 = x > \frac{3}{2}$

3.

$2(2x - 3.5) - 3(2 - 3x) < 6(1 - x) = 4x - 7 - 6 + 9x < 6 - 6x = 13x - 13 < 6 - 6x = 13x + 6x < 6 + 13 = 19x < 6 + 13 = 19x < 19 = x < 1$

$\frac{3x + 7}{2} - \frac{5x - 2}{2} < x = 3x + 7 - (5x - 2) < 2x = 3x + 7 - 5x + 2 < 2x = - 2x + 7 + 2 < 2x = - 2x + 9 < 2x = - 2x - 2x - 9 = 4x < - 9 = x > \frac{9}{4}$