Excellent composition of 200 words

There are many!
1、
My father's hobby is neither smoking nor drinking, but collecting exquisite stamps. After dinner, my father can't wait to take out a large and thick stamp album, sit under the lamp and read it with relish. I often look over my head carefully. My father often says to me, "look, these are the stamps of the Chinese zodiac, and these are Guilin mountains and waters, There are also many characters, animals, and scenes in the story... " Every time I look dazzled, as if I had been brought into the hall of stamps. Perhaps this colorful, exaggerated, various kinds of stamps attracted me like magnets. Gradually, I fell in love with these stamps and began to collect stamps. My father cherished stamps very much. Once, I felt bored at home, so I took out my father's stamp album and looked at it page by page, I was attracted by a beautiful stamp. This is a monkey stamp from last year. There is a lovely black monkey on it. It has big mouth and ears. It's smiling. One hand holds a peach, and the other hand playfully puts it on his head. It's really interesting! My father said that this is the third set of monkey tickets, and this one is the most interesting At this time, I was a little thirsty, so I went to pour a glass of water. Unexpectedly, the wire tripped me, and the water in the glass spilled out, and some water fell on dad's stamp album. "No!" I yelled, and immediately wiped the water with paper. Ah, the stamps were wrinkled. I immediately put the stamp album away, thinking: what can I do? After dinner, dad looked at the stamps again, Soon he frowned and said angrily, "who made it?" and then he glanced at me. I had to admit it with hesitation. At that time, my father was angry and widened his eyes. I was very afraid. From then on, my father made rules for me. If I want to read the stamp album in the future, I must get his consent. Do you think my father is a "stamp fan"?
2、
Autumn is the harvest season. Soybeans, corn and sorghum are all ripe and bent down. The sky in autumn is very high, as if Pangu is still supporting the sky and the earth. The sky is so blue, as if a painter painted blue in the sky. The leaves of poplar are a little yellow, and the autumn wind blows, and the poplar is shaking, as if it is old and unstable. The crops are happy, because they all bear fruit, They are all talking about: "you see, how big the fruit I bear, I can rank first in the crops." "you see, the fruit I bear is no worse than you." the crops have produced rich fruits, leaving sweet to people, but they are gradually yellowing and aging. In the lawn of the school garden, grass sneaks out, It's like putting on a green uniform to the earth; the beautiful teaching building quietly said to me, "I'll shelter you from the wind and rain, you should study hard." the surrounding scenery seemed to say to me, "we all have achievements, do you have them? Let's compete!" only willow girl bowed her head, very sad, very sad. The crops comforted her one after another: "although you have no fruits, But you have a beautiful figure. You bring beauty to people. "Miss willow finally smiles. Autumn is beautiful. I love autumn!
3、
I have a beautiful pencil bag. It's rectangular. There are two small bags outside. They are flat inside and hard to take things. So I didn't put anything in them. But in the middle of the pencil bag, there is a "small world" of rulers, erasers, pens and pencils. They are almost full. Fortunately, I prepared a small pencil bag to separate the pencils and pens!
In the small bag on the right, I put my small eraser in it. They don't feel crowded at all, because they are thin and small. This kind of "room" is just right
In the bag on the left, there are small disks for math class. They love each other and get along well
I'm my favorite pencil bag. How about it, isn't it?
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What km / h is 1km / s equal to

3600

How to translate the 3A on page 23 of the first volume of the seventh grade English book

Dear Feifei,
Please take these things to your sister: her hat, watch, notebook key and ID card. The hat is under the dressing table, the watch is under the bed, the notebook is on the bed, the key is in the drawer, and the ID card is on the table
grandma

The greatest common divisor and the least common multiple of 16,13 and 36
I hope you can help me solve it as soon as possible

The greatest common divisor of 16, 13 and 36 is 1,
Least common multiple 1872

(1) We know that the sum of the solutions of the system of linear equations x-2y = k 2x + 3Y = K + 1 is equal to 1. What is the value of K

﹛ x-2y=k
2x+3y=k+1
The solution is x = (5K + 2) / 7, y = (1-k) / 7
∵ the sum of solutions of the system of linear equations x-2y = k 2x + 3Y = K + 1 is equal to 1
∴(5k+2)/7+(1-k)/7=1
5k+2+1-k=7
5k-k=7-2-1
4k=4
k=1

If a represents a rational number that is not equal to 0, try to compare the size of a and 1 / a (a ≠ 0)
I do a ＞ 1 / a ＜ 1 / A, a = 1 / a ＞ 1 / A

When A1 / A
-1=

1. A total of 1500 chickens and ducks are raised in the farm. One quarter of the number of chickens is 15 less than 40% of the number of ducks. How many chickens and ducks are raised in this farm?
1. 2
2. A job, a alone to 12 days to complete, B alone to 15 days to complete. Two people work together, in the middle of a due to transfer, so 10 days to complete the task

(1) There are x chickens and 1500-x ducks
1/4x=（1500-x）*40%-15
0.25x=600-0.4x-15
0.65x=585
x=900
1500-900 ducks = 600
A: 900 chickens and 600 ducks
(2) On the way, a was temporarily transferred, so he finished the task in 10 days,
That means B worked for 10 days
B did all: 10 △ 15 = 2 / 3
A dried all: 1-2 / 3 = 1 / 3
Days of dry nail: (1 / 3) / (1 / 12) = 4 (days)
A is less dry than B: 10-4 = 6 (days)

Find the function f (x) = x & # 178; - ax + 3, X belongs to the range of [- 2,6]

Need classified discussion
f(x)=x²-ax+3
The symmetry axis is x = A / 2, the opening of the image is upward, and the arithmetic mean of - 2,6 is 2
(1) A / 2 ≤ - 2, i.e. a ≤ - 4
In this case, the maximum value is f (6) = 39-6a
The minimum value is f (- 2) = 7 + 2A
The range is [7 + 2a, 39-6a]
（2）-2

Mathematics exercise book of grade one of junior high school
If a commodity is sold at a 60% discount on its price, it will lose 110 yuan, while if it is sold at a 20% discount on its price, it will earn 70 yuan

Price: (110 + 70) / 2 * 10 = 900 price: 900 * 0.6 + 110 = 650

Sequence 3.6.10.15.21 What is the general formula of?

an=3+(n-1)n(n+1)/2

Excellent composition of 200 words