В1. 2х-5 / 8 - 4х-3 / 7 < 1
7(2х-5)-8(4х-3) < 1*56
14x-35-32x+24 < 56
-18x < 67
x > -3 13/18
Наименьшее целое = -3
С1. -7 < 6a-5 / 4 < 3
{6a-5 / 4 > -7
{6a-5 / 4 < 3
{6a-5 > -28
{6a-5 < 12
{6a > -23
{6a < 17
{a > -23/6
{a < 17/6
{a > -3 5/6
{a < 2 5/6
-3 5/6 < a < 2 5/6
C2. {-0,4x < 2,5
{-0,5x ≥ 3,1
{1,05x ≥ -6,51
{x > -6,25
{x ≤ -6,2
{x ≥ -6,2
///////////////ХХХХХХ
---------------₀--------------.----------> x
\\\\\\\\\\-6,25\\\\\\\\\\\\-6,2
х= -6,2