Ask for an answer, it s best to talk about the method, and give wealth within three days a question,

1. There are two cases of an isosceles triangle, and the ratio of the number of internal angles is 5:2:2 or 5:

5:2, set the auxiliary parameter t, when the ratio of the number of internal angles is 5:2:

2, the three inner angles are 5t, 2t, 2t, so 5t+2t+2t=180, t=20, so the three inner angles are 100°, 40°, 40°; When the ratio of the number of internal angles is 5:5:2, the three inner angles are 5t, 5t, and 2t respectively, so 5t+5t+2t=180, t=15, so the three inner angles are 75°, 75°, and 30° respectively.

Its apex angles are 100° and 30° respectively.

2. Let the original price be x and the cost be y, according to the title: -240, and the solution is x=4200 (yuan).

Note: Profit = selling price - cost, 20% discount is 80% of the original selling price = original price.

1.Answer: 30 degrees or 100 degrees.

1) If the angle that accounts for 2 parts is the top angle, then the 2 low angles each account for 5 parts, the total is 12 parts, and the sum of the inner angles is 180 degrees, so each.

15 degrees, 5 parts of the top angle is 30 degrees.

2) If the corner that accounts for 5 parts is the top angle, then the 2 low angles each account for 2 parts, and the total is 9 parts, and the sum of the inner angles is 180 degrees, so each.

20 degrees, 5 parts of the top angle is 100 degrees.

2.Answer: The original price is 4200 yuan.

Set the original price to X yuan, according to the eight discounts, you will lose 240 yuan, such as nine discounts, you can also make a profit of 180 yuan, you can know, 1 discount of the original price of the goods.

It is equivalent to (240 + 180) = 420 yuan, so the original price is 4200 yuan.

1.Top angle: bottom angle = 5:2, 5a + 2a + 2a = 180; 5a = 100 degrees;

Bottom angle: when the top angle = 5:2, 5a + 5a + 2a = 180; 2a = 30 degrees;

So the answer is 100 degrees or 30 degrees;

Get x = 4200 yuan.

Question 1: The apex angle is 100 degrees or 30 degrees The two base angles of an isosceles triangle are equal. If the top corner:

Bottom angle = 5:2 then we can know that the top angle = 180 * (5 5 + 2 + 2) = 100 degrees; If the bottom corner: top angle = 5:

2, then the apex angle = 180 * (2 2 + 5 + 5) = 30 degrees.

The second question is to set the original price as x, and the cost of the commodity is c, then it is known by the title, and the second formula is subtracted from the first formula to obtain so x = 4200 yuan.

1.5:2:2,180 9 = 20°, apex angle = 100°

5:5:2,180 12 = 15°, apex angle = 30°

2.(240+180)*10=4200, because the original price * original price * cost price.

Solution: Through observation and analysis, it can be known:

The largest angle in the diagram is the obtuse angle in the parallelogram in the upper left corner, and its degree is 135°

135 The tails of the goldfish have a parallelogram, and the great horn is the largest.

For the first time, put two slices at the same time, bake one side first, and spend 2 minutes.

Then take out one tablet, put in the third tablet, and spend another 2 minutes.

Remove the baked slice, add the second slice and bake for another 1 minute.

The total cost of this is: 2 + 2 + 1 = 5 minutes.

Hope it works for you.

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Home is a bulky wooden table full of greasy, a bowl of soy sauce rice mixed with burnt yellow lard residue, a glass of milk made from expired and discounted milk powder, and a large box of popsicles.