18/45 = 2/5
3 4/15 = 49/15
74/21 = 3 11/21
Cos(2x+π/3)≤1/2
π/3+2πn≤2x+π/3≤5π/3+2πn
π/3-π/3+2πn≤2x≤5π/3-π/3+2πn
2πn≤2x≤4π/3+2πn
πn≤x≤2π/3+πn
x∈[πn;2π/3+πn]
<span>8<x<12
-3<y<-1
</span><span><span>1<-y<3</span>
</span><em><u>5<x+y<11</u></em>
<em><u>9<x-y<15</u></em>
a1=5, a2=8, d=а2-а1=3
а21=3*21+2=65
S21=(5+3*20/2)*21=(65/2)*21=682.5