tg(-11pi/6)=tg(pi/6-2pi)=tg(pi/6)=1/sqrt(3)
Х+3=2х-3; или х+3=-2х+3;
х-2х=-3-3; или х+2х=3-3;
х=6; или х=0
=(60/160 - 8/160) * 10/1=52/160 * 10/1 = 52/16 = 3,25
Решение: 5(2-х)-х+4<span>≤-4
10-5х-х+4</span><span>≤-4
6х</span><span>≤-4-4-10
6х</span><span>≤-18/:6
х</span><span>≤-3</span>