X/2=180°-30°=150°
x=300°=270°+30°
sin300°<0
sin(270°+30°)=-cos30°=-√3/2
X-y=3. ;
3x+2y=19;=>
x=3+y
3*(3+y)+2y=19 =>
9+3y+2y=19
5y=19-9
5y=19
y=2 =>x=3+2=5
D=81-4*1*(-22)=81+88=169
x1=-9+13/2=4/2=2
x2=-9-13/2=-22/2=-11
-2,3/2-2,3=-2,3/-0,3=23/10*10/3=23/3=7 2/3
<em><span>3(1-(-</span></em><em><span>2)(</span></em><em><span>5 степени</span></em><em><span>):(делится на)</span></em><em><span>1+2</span></em><em><span>=</span></em><em><span>3×3</span></em><em><span>3(поделить на 3</span></em><em><span>)=</span></em><em><span>33</span></em><span />