Sin(2p-a)=-sina
cos(3p/2-a)=-sina
следовательно -sina-sina=-2sina
X+(x+1.2)*2=16.8
X+2x+2,4=16,8
3x=16,8-2,4
3x=14,4
X=14,4/3
X=4,8
Ответ:4,8;6;6
(-4/5 - 5/4 + 2) * (-4)/(4-5) = (-16/20 - 25/20 + 40/20)*4 = -1/20 * 4 = -4/20 = -1/5 = -0,2
1, 5x+8<span>≥-3x
2 5x+3x</span><span>≥8</span>
3,8x<span>≥8</span>
4,x<span>≥8/8
5,x</span><span>≥1</span>