Words for children in Wenchuan earthquake Need an article for children in Wenchuan earthquake! Big brother, big sister!

Words for children in Wenchuan earthquake Need an article for children in Wenchuan earthquake! Big brother, big sister!

Golden 72 hours
——A letter to a schoolmate still buried in the ruins after the Wenchuan earthquake
Dear children
Three days, are you ok? Hungry and thirsty? Is the wound still painful? Did you hear the call of the rescue team uncle?
You still don't know what happened! At 2:28 p.m. on May 12, 2008, you were still in the classroom quietly. Suddenly, the mountain collapsed and the teaching building shook violently like drunk. In an instant, it was like being cursed by the devil, and all the good things were torn to pieces! You tried to wake up from the nightmare and see your mother's concerned eyes as usual, but it was dark around, The pain in your heart tells you that this is not a dream, it is a huge disaster! Hundreds of thousands of people are sent to hell in an instant, and the prosperous city becomes a ruin
Three days, are you ok? Hungry and thirsty? Is the wound still painful? Did you hear the call of the rescue team uncle?
It's raining all the time outside, like the tears of heaven's crying. Did it seep to your side and moisten your dry lips? The 8.0 magnitude earthquake interrupted the communication, power and traffic in Wenchuan, and blocked the rescue vehicles. However, a large number of rescue troops are coming to you on foot, and the search and rescue dogs and life detectors are looking for your location, 72 hours after the disaster is the golden time for rescue. Hold on! Hope is just around the corner! Your mother is waiting for you to come back to her
Three days, are you ok? Hungry and thirsty? Is the wound still painful? Did you hear the call of the rescue team uncle?
The magnitude 8.0 Wenchuan earthquake shocked the whole world. The primary and secondary school students suffered the most casualties. Many friendly countries, compatriots from Hong Kong, Macao and Taiwan, and people all over the country have extended a helping hand. Dear grandfather Wen has spared no effort to come to you and rescue you from the tiger's mouth, Hold up the floor of your body, save you from the ruins! But now I have to donate my pocket money, hope it can turn into a spring, moisten your throat, turn into a single garment, warm your thin body, turn into a pen, write your new tomorrow!
I believe that this little bit of love will converge into a torrent of love! I tell you that we are also full of tears, we are anxious, we are praying devoutly. I believe that this torrent of love will comfort your hurt body and mind, and will ignite the hope in your heart. No matter what you have lost, no matter what you will face, please firmly believe that you will never, never, never feel lonely, Young pioneers all over the country are with you, and hundreds of millions of Chinese hearts are with you. We will certainly be able to rebuild our beautiful home!
Three days, are you ok? Are you hungry and thirsty? Is the wound still painful? Did you hear the call of the rescue team uncle

What is the simple calculation of 73 * 73 + 73 * 27?

73*73+73*27
=73*(73+27)
=73*100
=7300

Let f (x) = log2 ^ x-logx ^ 4 (0

[seeking general terms]
F (x) = log2 ^ X - 2 / log2 ^ x (and 0 < x < 1)
∴ f(2^an) = log2^(2^an) - 2 /log2^(2^an) = an - 2/an = 2n
And 0 < 2 ^ an < 1, that is, an < 0
It is reduced to (an) &# 178; - 2n * (an) - 2 = 0
△ = (2n)² - 4*1*(- 2) = 4(n² + 2)
∴ an = [ 2n ± √△ ] / 2
= n ± √(n² + 2)
And an < 0, so an = n + √ (n & # 178; + 2) is omitted
The general formula is an = n - √ (n & # 178; + 2)
On the monotonicity of {an}
a - a = n+1 - √[(n+1)² + 2] - n + √(n² + 2)
= 1 + √(n² + 2) - √(n² + 2n + 3)
∵ n & # 178; + 2 ＞ n & # 178; ≥ 0, that is √ (n & # 178; + 2) ＞ n & # 178; = | n|
And N ∈ n,
∴ √(n²+2) ＞ n
∴ 2√(n²+2) ＞ 2n
Add n & # 178; + 3 to both sides at the same time
n²+3 + 2√(n²+2) ＞ n²+3 + 2n ＞ 0
That is, n & # 178; + 2 + 2 √ (n & # 178; + 2) + 1 ＞ n & # 178; + 2n + 3 ＞ 0
Square both sides at the same time
1+ √(n²+2) ＞ √(n² + 2n + 3)
So there are,
1 + √(n² + 2) - √(n² + 2n + 3) ＞ 0
That is, a > A (where n is any positive integer)
The sequence {an} is monotone increasing sequence

The standard of a taxi in a city is 9 yuan within 3 kilometers, 2.4 yuan per kilometer beyond 3 kilometers. Xiao Ming takes a taxi from home to Xinhua Bookstore and pays 16.2 yuan in total
How many kilometers from his home to Xinhua bookstore? Fast

16.2-9 = 7.2 yuan
7.2 / 2.4 = 3km (how many kilometers are more than 3km)
3 + 3 = 6 km. (approximate distance from home to bookstore)

As shown in the figure, in the pyramid p-abcd, the bottom of PA ⊥ is ABCD, and the quadrilateral ABCD is a right angle trapezoid, ad ⊥ BC, ad ⊥ CD. (I) prove: CD ⊥ PD; (II) if ad = 2, BC = 3, f is the midpoint of PD, be = 13bc, prove: EF ⊥ plane PAB

(1) ∨ PA ⊥ bottom ABCD, ∨ PA ⊥ CD, and ∨ ad ⊥ CD, ad ∩ PA = a ∩ CD ⊥ planar pad by PD ⊂ planar pad ⊥ CD ⊥ PD; (II) take the midpoint g of PA, connect eg, FG, AE, BG, then GF = 12ad = 1, and GF ∥ ADBE = 13bc = 1, and be ∥ ad, so be = GF, and be ∥ GF, so the quadrilateral begf is flat

The power 0 of (2x + 1) is 1, and the value range of X is?

The power 0 of (2x + 1) is 1, and the value range of X is x ≠ - 0.5
Just make sure that 2x + 1 ≠ 0

A taxi company has 100 taxis, and the average daily gasoline cost of each taxi is 80 yuan. In order to reduce environmental pollution, the market introduces a device called "CNG" to convert gasoline to natural gas, and the price of each taxi is 4000 yuan. After the company refits some vehicles for the first time, it calculates that the daily fuel cost of the refitted vehicles accounts for the daily fuel cost of the remaining unmodified vehicles Q: (1) how many taxis has the company refitted? How much is the average daily fuel cost of each taxi after modification lower than that before modification? (2) If the company refits all taxis at one time, how many days can it recover the cost from the saved fuel cost?

(1) Suppose the company refits y taxis for the first time, and the fuel cost of each taxi after refitting is reduced by a percentage of X. according to the meaning of the problem, the equations are as follows: 80 (1 − x) y = 320 × 80 (100 − y) 2Y × 80 (1 − x) = 25 × 80 (100 − 2Y). The solution is x = 25 = 40%, y = 20 The daily fuel cost of the car is 40% lower than that before modification; (2) if the cost can be recovered in M days after one-time modification, then 100 × 80 × 40% × M = 4000 × 100, so m = 125 (days) a: if the company refits all taxis at one time, the cost can be recovered from the saved fuel cost in 125 days

Known angle man = 120 degrees, AC bisector angle man, angle ABC + angle ADC = 180 degrees, to verify whether AB + ad is equal to AC, gods help

In DM, take de = AB to connect EC as CF ⊥ am to F, CP ⊥ an to P, because ∠ ADC + ∠ ABC = 180 °∠ ADC + ∠ EDC = 180 °∠ EDC = ∠ ABC AC bisector man, so CF = CP ∠ CFD = ∠ CPB = 90 ° so △ CFD ≌ CPB CD = CB, ed = AB, ∠ EDC = ∠ ABC ≌ Dec ≌ BAC ≌ CED = ∠

Master Wang plans to process a batch of parts in two hours. When there are 160 parts left, the machine breaks down and the efficiency is 1 / 5 lower than the original plan. As a result, the task is delayed by 20 minutes. How many parts are there?

When 20 points = 13, 1-15 = 45160 ^ [13 ^ (1 ^ 45-1)] × 2, = 160 ^ [13 ^ (54 − 1)] × 2, = 160 ^ [13 ^ [14] × 2, = 160 ^ 43 × 2, = 120 × 2, = 240 (pieces); answer: there are 240 pieces of this batch of parts

Come and help me solve the math problem. It looks very simple, but it's not easy to do
1. The result of two addends and their sum is 0.6. It is known that one addend is 0.2, and what is the other addend?
2. The coal yard transported 1.5 tons of coal in the morning and some in the afternoon. A total of 4.3 tons of coal were transported in one day. How many tons of coal were transported in the afternoon?

1: 0.6 △ 2 = 0.3 (sum of two addends)
0.3-0.2 = 0.1 (another addend)
2: 4.3-1.5 = 2.8 (delivered in the afternoon)