-12sqrt(6) tg300 cos 675 = -12sqrt(6) tg(180+120) cos(720 - 45) = -12sqrt(6) (tg120) cos(45) = -12sqrt(6) (-tg60) cos45 = 12sqrt(6) sqrt(3) 1/(sqrt(2) = 12 * 3 = 36
5х-3.2-4х+1=х-2.2
Если х=-0.4 то х-2.2 = -0.4-2.2=-2.6
<span>(6х-28)-(Х-9)=41
6х-28-х+9=41
5х-19=41
5х=41+19
5х=60
х=60:5
х=12</span>