1. A={18, 19, 20, 21}
B={2, 3, 5, 7, 11, 13}
C={29, 31, 33, 35}
D={1, 2}
3. M={1, 3, 5, 7}
{1}
{3}
{5}
{7}
{1, 3}
{1, 5}
{1, 7}
{3, 5}
{3, 7}
{5, 7}
{1, 3, 5}
{1, 3, 7}
{1, 5, 7}
{3, 5, 7}
{1, 3, 5, 7}
4. D36={1, 2, 3, 4, 6, 9, 12, 18, 36}
D40={1, 2, 4, 5, 8, 10, 20, 40}
M7={x|x€N, x</=35}
M7={0, 7, 14, 21, 28, 35}
M4={x|x€N,x</=28}
M4={0, 4, 8, 12, 16, 20, 24, 28}
6. (80, 600)=2³•5=40
80|2•5 80=2⁴•5
8|2
4|2
2|2
1
600|2•5 600=2³•5²•3
60|2•5
6|3
2|2
1
[270, 588]=3³•2²•5•7²=26460
270|2•5 270=3³•2•5
27|3
9|3
3|3
1
588|3 588=3•2²•7²
196|2
98|2
49|7
7|7
1
9. 180°-105°=3°
90°-53°=37°
11. x+2x+30°+3x+40°+2x-20°+x+40°=360°
9x+30°+40°-20°+40°=360°
9x+90°=360°
9x=360°-90°
9x=270 x=270:9 x=30
1=x=30°
2=2x+30°=90°
3=3x+40°=130
4=2x-20°=40°
5=x+40°=70°
