As shown in the figure, OC is the bisector of ∠ AOD, OE is the bisector of ∠ BOD. If ∠ AOB = 130 °, what is the degree of ∠ COE?

As shown in the figure, OC is the bisector of ∠ AOD, OE is the bisector of ∠ BOD. If ∠ AOB = 130 °, what is the degree of ∠ COE?

∵ OC is the bisector of ∠ AOD, OE is the bisector of ∠ BOD, ∵ doc = 12 ∠ AOD, ∵ DOE = 12 ∠ BOD, ∵ AOB = 130 °, and ∵ COE = ∠ doc + ∠ DOE = 12 (∠ AOD + ∠ DOB) = 12 ∠ AOB = 12 × 130 ° = 65 °

The first day of junior high school geometry drawing diagram application problem!
It is known that the length of line AB is 18 cm, point C is on the extension line of line AB, and AC = 5 / 3 BC, then how many cm is the line BC

Let BC = X
Then: AC = AB + BC = 18 + X
And because: BC = 5 / 3x with AC = 5 / 3
So: 18 + x = 5 / 3x
Solution equation: x = 27
So BC = 27
I'd like to give you the drawing, but I don't want the illustration here. A, B and C are in a straight line
This is your homework, isn't it? You'd better understand it thoroughly, don't copy the answer directly

40 calculation questions and 30 geometry questions in grade one of junior high school
I'll hand it in tomorrow morning
8: Give it to me before 00
Or it's off
There must be an answer
Otherwise, no points will be given

1.3/7 × 49/9 - 4/3 2.8/9 × 15/36 + 1/27 3.12× 5/6 – 2/9 ×3 4.8× 5/4 + 1/4 5.6÷ 3/8 – 3/8 ÷6 6.4/7 × 5/9 + 3/7 × 5/9 7.5/2 -（ 3/2 + 4/5 ） 8.7/8 + （ 1/8 + 1/9 ） 9.9 × 5/6 + 5/6 10.3/4 ×...

The number of male workers is 60% of that of female workers, and female workers account for 25% of the total number of workers in the factory

Wrong
Female workers account for 1 △ 1 + 60% of the total number of employees = 67.5%

Given X-Y = 4xy, find the value of (2x + 3y-2y) / (x-2yx-y)

Did you type the title wrong
If X-Y = 4xy, find the value of (2x + 3yx-2y) / (x-2yx-y)
Because X-Y = 4xy
The original formula = [2 (X-Y) + 3YX] / [(X-Y) - 2yx] = (2 * 4yx + 3YX) / (4yx-2yx)
=11YX/2YX =11/2

In 2008, China held the 29th Olympic Games, then the Olympic Games will be held every four years, and the 40th will be held every four years. In that year, you will be () years old
I'm 13 years old!

54 years old in 2052

Given the algebraic formula 3Y ^ 2-2y + 6 = 8, find the value of the algebraic formula y ^ 2-3 / 2Y + 1

3Y ^ 2-2y + 6 = 8, y ^ 2-2y / 3 + 2 = 8 / 3, your topic is wrong, according to your meaning, the requirement should be y ^ 2-2y / 3 + 1 = 5 / 3

Sixth grade students organize books for the school library. They have sorted out 1000 books, accounting for two fifths of the total number of books
How many books are there in the library?

Ha ha
Simple
Use 1000 △ two fifths = 1000 × five fifths
The result is 2500 copies
Be sure to adopt a~~

(18 + 56-28) x (1 + X%) - 18 = 46, how much is X. thank you
(18+56-28)x(1+X％)-18=46
How much is x, please. Thank you

18+56-28=46 46-18=28 46×（1+x%）=28 28÷46=（1+x%）
1.643=1+x%
x%=0.643

The average number of the three numbers of a, B and C is 12. The ratio of the three numbers is 2:3:4. What are the numbers of a, B and C?

12×3÷(2+3+4)
=36÷9
=4
4×2=8
4×3=12
4×4=16
A: A is 8, B is 12, C is 16