What are the multiples of 2 within 100

What are the multiples of 2 within 100

0、2、4、6、8、10、
12、14、16、18、20、
22、24、26、28、30、
32、34、36、38、40、
42、44、46、48、50、
52、54、56、58、60、
62、64、66、68、70、
72、74、76、78、80、
82、84、86、88、90、
92、94、96、98、100

Answers to the exercise book of Beijing Normal University (Volume 1, grade 6) P26
Xiaoxiao and mischievous each have some money. After Xiaoxiao gives one sixth to mischievous, mischievous gives 20% to Xiaoxiao. At this time, they each have 120 yuan. How much did Xiaoxiao and mischievous originally have?

Let Xiaoxiao and naughty have X and Y yuan respectively
5/6x+1/5（1/6x+y）=120
4/5（y+1/6x）=120
The solution is x = 108, y = 132,
That is, Xiaoxiao originally had 108 yuan, naughty originally had 132 yuan

Five red, yellow, blue and white balls of the same size are put together in a box. At least a few balls can be found to ensure that two balls of the same color can be taken

Worst case scenario: if you find out that all the four are of different colors, then you can find out that there must be two of the same ones
At least five

What is 3 / 11 of the sum of 2 / 3 and 1 / 6

3/11（2/3+1/6）=5/22

Urgent (⊙ o ⊙)
1. There are numbers on the five cards: you can use them to form many different five digit numbers, and find out the average of all these five digit numbers.
2. The little rabbit and the little cat go up the stairs together. The speed of the little cat is twice that of the little rabbit. Q: when the little rabbit goes up to the fourth floor, the little cat goes up to the () floor.
3. A kind of wild grass can grow to 48mm in 12 days. When it grows to 6mm, it takes () days.
4. Xiaoqiang has two packages of candy, one is 48, the other is 12. He takes three from the more package and puts them into the less one. After () times, he can make the number of candy in the two packages equal. There are two piles of fruit, one pile of apples and one pile of pears. If you trade an apple for a pear, there will be two more apples. If you trade a pear for two apples, there will be one more pear. Think about it, there are () apples and () pears. 8. To build a road, there are still 2.6 kilometers left, which is 0.2 kilometers more than half of the road. The total length of the road is () km. 9. A barrel of oil weighs 5.6kg, and it weighs 3.1g even after half of the oil is used. This barrel of oil weighs () kg net.

1. The average of all these five digit numbers is (22222)
2. When the rabbit goes up to the fourth floor, the kitten goes up to the sixth floor
3. It takes (9) days when the grass grows to 6 mm
4. Only after (6) times can the number of two packages of candy be equal
There were (5) apples and (3) pears
8. The total length of the road is (7.4) kilometers
9. The net weight of this barrel of oil is (5) kg

Simplify a sequence formula
From an = 1 / 2 [an ^ 2 + an] - 1 / 2 [a (n-1) ^ 2 + a (n-1)] to [an + a (n-1)] [an-a (n-1) - 1] = 0 note (n-1) is the subscript

An = 1 / 2 [an ^ 2 + an] - 1 / 2 [a (n-1) ^ 2 + a (n-1)] multiply both sides by 22An = an ^ 2 + an-a (n-1) ^ 2-A (n-1) shift an ^ 2-A (n-1) ^ 2 + an + a (n-1) = 0 [an + a (n-1)] [an-a (n-1)] + [an + a (n-1)] = 0, extract the common factor to get [an + a (n-1)] [an-a (n-1) + 1] = 0

How many liters is one cubic meter?

One cubic meter equals 1000 cubic decimeters, so one cubic meter equals 1000 liters

Chinese, mathematics, English preview methods and review methods

In fact, the three methods are almost the same, I will not say more
Preview:
Preview should adhere to: 1. Do not look at any reference materials, self preview, can understand deeper
2. While reading a book, make notes, remember all the questions and opinions, and wait until the class, listen to the class with questions and their own understanding, the effect is better
3. Of course, reference materials should also be used. How to use them is the key. It is suggested that after listening to the teacher's lecture, if there is anything you don't know, you can use them. Of course, it's better to use them in review
review:
Review should pay attention to: 1. Do not use the sea of questions tactics, choose the fine questions, that is, the teacher said the examples and mentioned some classic questions. These questions can be found in reference books
2. Use notebooks frequently. The contents recorded in the notes are often excellent. If you don't read them, there is no need to take notes. Therefore, you should read them frequently
These are almost, and then do not let yourself too tired, pay attention to the combination of work and rest
I wish you good grades!

Simple calculation of 101 times 5.4

101 times 5.4
= 100x5.4+1x5.4
=540+5.4
=545.4

(1) 134 − 56 − 116 − (− 12); (2) 1 - [− 1 − (− 37) − 5 + 47] + | - 4 |; (3) 1-2 + 3-4 + +1997-1998+1999．

(1) The original formula is 134 + 24-56-116 = 214-2 = 14; (2) the original formula is 1 - (- 1 + 37-5 + 47) + 4 = 1 + 5 + 4 = 10; (3) the original formula is 1 + (- 2 + 3) + (- 4 + 5) + +（-1998+1999）=1+1+1+… +11000 = 1000