Travel composition I went to a park in a city to play with my friends!

Travel composition I went to a park in a city to play with my friends!

During the National Day holiday, we took a special train to Gansu, Ningxia and Qinghai. We had a good view of the plateau, desert, lakes and other great rivers and mountains of the motherland. We learned about the local conditions and customs of the Tibetan, Tu and Hui Nationalities. Our country is really a multi-ethnic harmonious garden, and we also tasted delicious food of different flavors. This is really an unforgettable tour!
This time, we took a luxury train. This train is very different from the one I used to take. The whole train is a four person box type soft sleeper train with thick red wool carpet and gilded door handles. The smiling conductor has provided us with thoughtful service and delicious food. In these seven days, the train is just like our home, When we get tired of playing one day and go back to the tidy train, we sleep in our mobile "home" like home. The next day, our mobile "home" takes us to the next station. It takes us through Hebei, Henan, Shaanxi, Shanxi, Ningxia, Qinghai and Gansu provinces, with a total distance of more than 5500 kilometers
During this trip, not only the time on the train is unforgettable, but also the famous scenic spots such as Maiji Mountain Grottoes, Qinghai Lake and Tengger Desert
Maijishan Grottoes is located in Tianshui, Gansu Province. Its name comes from the fact that the mountain looks like wheat piled from the foot of the mountain. There are thousands of clay figurines carved on the mountain. They are vivid in expression, different in shape, various in appearance and lifelike. It is one of the four major Grottoes in China
Qinghai Lake is located in Qinghai Province. It is the largest salt water lake in China. Its beauty can only be experienced personally and carefully. It is difficult to describe clearly in words. In this salt water lake, there is a unique kind of rare fish, Huangyu, because it only grows one kilogram in one year or two or ten years. In addition to the overfishing before, it is now on the verge of extinction
Shapotou scenic spot in Tengger desert is located in Ningxia, where I learned the Yellow River and desert scenery. Originally, this is not a scenic spot, but today's Shapotou Park came into being after the opening of Baotou Lanzhou railway
During this trip, we also bought many local specialties, such as red, black, white and Huangbao medlar, Nostoc flagelliforme, erhyangpi, licorice, saffron, Rhodiola, yak jerky, and so on. We also bought Helan stone ornaments, desert roses and other natural crafts. I really like these specialties. In order to buy more souvenirs in these seven days, I always said to my mother: "this is to contribute to the west"!
Back home, I have been immersed in happy memories, long unforgettable, this is really an unforgettable trip

I am xiaoyudi

If I am a small raindrop, I will walk around the world, give all that I should give, and do my best to help, so that everyone will like me. If I am a small raindrop, when I hear the husky cry of the seedlings, I will call my companion, make concerted efforts to have a heavy rain, let the seedlings jump in our happy songs

If 14 > 2A > 15 and a is a non-zero natural number, then a is______ ．

Because 14 ＞ 2A ＞ 15, then 5a20a ＞ 4020a ＞ 4a20a, and 5A ＞ 40 ＞ 4a, can be converted into two inequalities: 5A ＞ 40, 4A ＜ 40, the solution is: 10 ＞ a ＞ 8; so a should be 9. So the answer is: 9

In 1, + 2, 1.3, - 7, 27, 0, 2 / 3, - 49, 10.09, () is a natural number, () is an integer, () is a positive number, () is a negative number

In 1, + 2, 1.3, - 7, 27, 0, 2 / 3, - 49, 10.09,
(1, + 2, 27, 0) are natural numbers
(0, 1, + 2, - 49, - 7, 27) are integers
(1, + 2, 1.3, 27, 2 / 3, 10.09) are positive numbers
(- 7, - 49) are negative numbers

What's the next number to fill in

0*1+1=1
1*2+2=4
4*3+3=15
15*4+4=64
therefore
64*5+5=325
I've been thinking about it for a long time

Given that n is a positive integer and n4-16n2 + 100 is a prime number, find the value of n

∵ n4-16n2 + 100 = N4 + 20n2 + 100-36n2 = (N2 + 6N + 10) (n2-6n + 10), ∵ N2 + 6N + 10 ≠ 1, and n4-16n2 + 100 is prime, that is | (n-3) 2 = 0, the solution is n = 3

Exponential function: x ^ 3 / 2 = 8, find X

x^3=8^2
x^3=64
x=64^1/3
x=4

English riddle: what is the next letter? J, a, s, O, n

D initials from July to December

Factorization ① x ^ 4 + x ^ 3-x ^ 2-x ② 1-m ^ 2-2mn + 2n

x^4+x^3-x^2-x
=(x^4+x^3)-(x^2+x)
=x^2(x^2+x)-(x^2+x)
=(x^2+x)(x^2-1)
=x(x+1)(x+1)(x-1)
=x(x+1)^2(x-1)
1-m^2-2mn+2n
=1-m^2-(2mn-2n)
=(1-m)(1+m)-2n(m-1)
=(1-m)(1+m)+2n(1-m)
(1-m)(1+m+2n)

Application of quadratic equation of one variable in the third grade of junior high school
There are 10 peach trees in an orchard, with an average of 100 peaches per tree. Now we are preparing to grow a variety of peach trees to improve the yield. The experiment found that for each variety of peach trees, the yield of each peach tree will be reduced by 2. If we want to increase the total yield by 80%, how many peach trees should be planted?
1;
2. Solve the equation and find out how many trees to plant

Setting: we should learn more about peach trees
（10+x）*(100-2*x)=(1+80%)*(10*100)
The solution is: x = 20