Given the first n terms of the sequence {an} and Sn = n ^ 2An (n ≥ 2), and A1 = 1, by calculating A2, A3, we guess that an is equal to? Sn = n ^ 2An (n ≥ 2), n ^ 2 is the square of --,

Given the first n terms of the sequence {an} and Sn = n ^ 2An (n ≥ 2), and A1 = 1, by calculating A2, A3, we guess that an is equal to? Sn = n ^ 2An (n ≥ 2), n ^ 2 is the square of --,

This is the first time that we are going to be in the state of a (a1 + A2 = 1 + A2 = 1 + A2 = 1 / 3; a = 1 / 3; a = 3 = 1 + 1 / 1 / 3 + a3 = 1 + 1 / 3 / 3 + a3 = 1 + 1 / 1 / 3 + a3 = 1 / 1 / 3 / 3; a = 1 = 1 / 2; (a (23a) 2 = 1 / 3 = 1 = 1 / 3; (a (a) A2 = 1 / 3 = 1 / 3; S3 = 1 / 3; S3 = 1 / 3; S3 = 1 / 3; S3 = 1 / 3; S3 = 1 / 3 / 3 = 1 / 3 = 1 / 6 = 1 / 6 = 1 / 6 = 1 / 6 = 1 / 6 = 1 / 6 = 1 / 6 / 6 = 1 / 6 / 6 / 6 / 2 / 2 / 6 / 2 / 2 / 2 / 2 / 2 / 3 [3 [3 [3 [3 [3 [3 [3 [3 [3 [3 [3 [3 [3 (3 (3 it's not easy

The acceleration of a truck during emergency braking is 5m / S2. If the speed of the truck is 10m / s at the beginning of braking, find: (1) the displacement within 1s after braking; (2) the displacement within 3S after braking and the average speed within 3S

(1) The time to stop is t0 = 0 − v0a = − 10 − 5S = 2S ＞ 1s. Therefore, if the truck has not stopped within 1s, the displacement x = v0t + 12at2 = 7.5m. Therefore, the displacement within 1s after braking is 7.5m

Xiao Ming and Xiao Gang often practice running on the 400 meter long circular track. Xiao Ming's speed is 8 meters per second, and Xiao Gang's speed is 7 meters per second, if they are facing each other on the same ground at the same time
And yes, after a few seconds, they met for the first time,

The first time they met, the total distance they ran was 400 meters
Two people run 8 + 7 = 15 meters per second
The first encounter time is 400 / 15 ≈ 26.67 seconds

The scoring rules of football match are: 3 points for winning a game, 1 point for drawing a game, 0 point for losing a game. A football team has played 12 games in a certain season, only lost 2 games, and scored 22 points in total. How many games has this team won?

Let's win the X game
3x＋（12-2-x）×1＝22
3x＋12-2-x＝22
2x＋10＝22
x＝6

If a line segment AB with length of 2008cm is drawn randomly on the number axis, the number of integral points covered by the line segment AB is? () or ()
The unit length of a number axis is 1cm (placed at the front)

2008 or 2009

There are three pieces of cloth, 11 square decimeters, 110 square decimeters, 1100 square decimeters, which area is closer to 1 square meter

110 square decimeters is closer to 1 square meter

Chapter 2 2.2 addition and subtraction of integral (2)

1.-4xy 2.4(a+b) 3.-x2y+xy2 4.t,11t 5.4a+2b
6.3/8πR2 7.1.2an 8.6n+9
CD
1-a2+ab-3b2
5a2-11ab+b2
1/2a2
6a2+4b2+4c2
A+B=x2
The space represents the next question

Choose 6 consecutive natural numbers from 1-999 so that there are exactly 4 zeros at the end of their product. How many choices are there?
The third floor is a bit of a mess, but I don't know how to get 17

There are six consecutive natural numbers, three odd and three even numbers, and four zeros at the end,
Then four five and four two in each of the six numbers can be decomposed
125 = 5 * 5 * 5. There are two methods to select the one containing 125
120*121*122*123*124*125
125*126*127*128*129*130
250=5*5*5*2
375=5*5*5*3
------------
875=5*5*5*7
Similarly, including 250375500625750875, there are two kinds of selection
Therefore, there are 2 * 7 = 14 methods

A passenger car and a freight car start from a and B at the same time, and run in opposite directions. After three hours, they meet. The freight car runs 45 kilometers per hour, and the speed of the passenger car is five times faster than that of the freight car. How many kilometers is the distance between a and B?

【45+45（1+1/5）】×3
=297 km

The maximum value of the function y = - 1x2 + 3x is______ ．

Let 1x = V, then the original formula can be reduced to y = - V2 + 3V = - (v2-3v) = - (v-32) 2 + 94. The maximum value is 94