См. Пошаговое объяснение
Пошаговое объяснение:
Для решения обеих задач используются следующие свойства углов:
1) вертикальные углы равны.
2) развёрнутый угол равен 180°.
а)
∠СОЕ = ∠FOD - как углы вертикальные; следовательно:
2х - 30° = х + 10°
х = 40°
∠СОЕ = 2х - 30 = 2 · 40 - 30 = 80 - 30 = 50°
∠FOD = ∠СОЕ = х + 10 = 40 + 10 = 50°
∠СОF = ∠EOD = 180° - 50° = 130°
∠FOD = ∠СОЕ = 50°
∠СОF = ∠EOD = 130°
b)
∠СОЕ = ∠FOD - как углы вертикальные; следовательно:
4х - 35 = 2х + 21
2х = 56
х = 28°
∠СОЕ = 4х - 35 = 4 · 28 - 35 = 112 - 35 = 77°
∠FOD = ∠СОЕ = 2х + 21 = 2 · 28 + 21 = 56 + 21 = 77°
∠СОF = ∠EOD = 180° - 77° = 103°
∠FOD = ∠СОЕ = 77°
∠СОF = ∠EOD = 103°
1. 4/30. 2. 5/9. 3. 3/5. 4. 1/5. 5. 11/30. 6. 1/10
Пошаговое объяснение:
1. 1)30/300 + 80/300 = 110/300
2)150/300 - 110/300 = 40/300, сокращаем на 10 = 4/30
2. 1)21/90 + 16/90 = 37/90
2)37/90 + 13/90 = 50/90, сокращаем на 10 = 5/9
3. 1)15/50 + 2/50 = 17/50
2)47/50 - 17/50 = 30/50, сокращаем на 10 = 3/5
4. 1)3/20 - 1/20 = 2/20
2)6/20 - 2/20 = 4/20, сокращаем на 4 = 1/5
5. 1)10/300 + 90/300 = 100/300
2)210/300 - 100/300 = 110/300, сокращаем на 10 = 11/30
6. 1)30/100 + 50/100 = 80/100
2)80/100 - 70/100 = 10/100, сокращаем на 10 = 1/10
to tell, as I rested this summer. The first month of holidays spent in the preparation of
for the competition, which took place in the Tauride this urban village. The competition was fun, though, we took
the last place. After the competition me and my parents went to rest in
Kazakhstan was a lot of fun . I was in Astana saw many very interesting. When
I came home, I had at school internship. In practice, we
help the school, performing various jobs.
In the evening I
went for a walk with friends. After practice I went to the city of Omsk. In the city I'm good
had a rest. Home When it rained, I heard the music and watched movies. These holidays
I spent the gut. Write
me, how did you spend your holiday!