Please help me write this question in detail, thank you, urgent

There is no diagram, I made the title with a diagram drawn by myself. I don't know if there's a difference with yours.

Over a as an ae perpendicular to bc to bc to eOver D as DF perpendicular to BC to F to BC. ∠d=120°，∠c=60°.

ef=ad=20m.Let the height of the trapezoidal be x. Then there is tan b=x fc tan c=x be. And there is fc+be+ef=80. Find x=15 root number 3

Trapezoidal area 1 2 * (20 + 80) * 15 root number 3 = 750 root number 3

750 root number * 10 = 7500 root number 3 is approximately equal to 12990

Hello landlord, I am happy to answer the question for you, and the answer to this question is as follows:

It is easy to know that fdc=30°, in abe, be=ae tan30°= 3x, in dfc, fc=df·tan30°= 3 3·x, and bc=be+ef+fc= 3x+ 3 3·x+20=80x=15 3

The area of the trapezoid = (20+80)·

It costs 1299 10 = 12990 yuan to buy this batch of turf.

A: It costs 12,990 yuan to buy this batch of turf.

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This question is a very typical question in junior high school, but it is actually very simple, you just need to make the formulas on both sides of the plus sign equal to zero.

Reams x 3 0

y 2 0, x 3 y 2

So x y 5

Since both parts have absolute values, they can only be added to two zeros to give x 3 0, y 2 0, so x is 3 and y is 2, then add up to 5

The sum of the absolute value and the square number is zero, so that each is zero. Therefore x=3 and y=2. Get x+y=5

Convertible corporate bonds are converted into corresponding shares (5000 + 300) 10 5000 is the face value of the convertible bond 300 is the interest of 2009 (payable on January 5, 2010) The title says: the initial conversion price is 10 yuan per share, the ** face value is 1 yuan per share, the number of shares converted should be calculated according to the sum of the face value and interest of the bond, and the part less than 1 share at the time of conversion is paid in cash.

The amount of shares obtained by Company A is (5000+300) 10

20° bar, connect od to make two triangles congruence.

<> diagram such as the Friendship Reputation slag section of the notice.

If you return to hunger, you will be able to simulate a leaky fiber figure with wide limbs.

If the number of people in the car is x, then the number of people in the car is 3x, so there is.

3x－6=4（x－6）

3x－6=4x－24

x=1818 3=54 (person).

That is, the car originally had 54 people.

Let's say all 30 coins are.

If the source is 5 points, then the total amount should be.

30 (yuan).

more than actual - yuan).

5 points is more than 2 points - yuan).

So there are 2 cents of coins

Then there are 30-17=13 (pieces) of 5 cents

2x+5y=99, x+y=30, the solution is x=17, y=13, so 17 pieces of two points and 13 pieces of five.

Solution: Set up a large box of drinks.

X bottles, a small box of drinks has Y bottles, then there is an equation: 1) 3x+2y=92 2) 5x+3y=150 The result from this is: x=24, y=10 So (1) 2 large boxes and 5 small boxes have 48 bottles and 50 bottles of drinks respectively (2) If a large box of drinks is 48 yuan, and the small box is 25 yuan, because the large box has 24 bottles and the small box has only 10 bottles, then it can be seen that the large box of drinks is 48 yuan per bottle 24 bottles = 2 yuan The bottle of small box drinks is 25 yuan per bottle 10 bottles = yuan It can be seen that the unit price of each bottle of small box drinks is more expensive than that of large box drinks, so it is more cost-effective to ensure that the quality of the two packaged beverages is exactly the same.

I'd rather die with incense on the branches, and how could he have blown down in the north wind. - Zheng Sixiao, "Painting Chrysanthemums".