Mathematics application problem is mathematics in life? Xiao Hong went on an autumn outing. In the process, she used 2 / 3 of her pocket money to buy some small gifts she liked. She used 2 / 3 of the remaining money to buy drinks. When she went home, she had 4 yuan left. How much did Xiao Hong take?

4÷（1-2/3）÷（1-2/3）=36

Write practical questions by yourself and answer them carefully (be realistic)

[the division sign is replaced by #, and the multiplication sign is replaced by X
1: There are 90 ping-pong balls in sporting goods. If every two are packed in a box, can they be just finished? If every five are packed in a box, can they be just finished? Why?
90 × 2 = 45 boxes 90 × 5 = 18 boxes
A: if you pack one box for every two, you can just finish. If you pack one box for every five, you can just finish. Because 90 can divide five
2: There are 57 balls in the sports shop, three of which are packed in one box. Can they be just finished?
57 × 3 + 19 boxes
A: it's just finished
3: A and B type a 10000 word document. A type 115 words per minute, B type 135 words per minute. How many minutes can they finish?
10000 # (115 + 135) = 40 points
A: 40 minutes
4: How many students are there in the fifth grade? 13x14 = 192 A: there are at least 192 people in the fifth grade. Although the following questions belong to practical problems, they are related to equations. I use equations to solve them
5: Two cars travel from one place to the other. One car travels 31 kilometers per hour, the other 44 kilometers per hour. After how many minutes, the two cars are 300 kilometers apart?
Equation: the two cars meet after X hours. 31x + 44x = 300 75X = 300 x = 44 hours = 240 minutes. A: after 240 minutes, the two cars are 300 kilometers apart
6: Team a digs 4 meters a day, team B digs 3 meters a day. How many days can we dig through the tunnel? Set X days to dig through the tunnel 3x + 4x = 119, 7x = 119, x = 17 A: dig through the tunnel after 17 days
7: There are 140 students in the school chorus and dance team. The number of students in the chorus is six times that of the dance team. How many students are there in the dance team? Suppose there are X students in the dance team, 6x + x = 140, 7x = 140, x = 20. A: there are 20 students in the dance team
8: It's 1300 meters long for two brothers to go to the gymnasium from home at the same time. The elder brother walks 80 meters per minute, and the younger brother goes back to the gymnasium by bicycle at the speed of 180 meters per minute. He meets his elder brother on the way. At this time, the elder brother walks for a few minutes? 1300x2 = 2600 meters 2600 # (180 + 80) = 2600 # (260 = 10 minutes). A: at this time, the elder brother walks for 10 minutes
9:: on June 1, children's day, Miss Wang bought 360 biscuits, 480 pieces of candy and 400 fruits, made exquisite small gift bags, and gave them to children as gifts. At most, how many small bags can be made? 360+480+400=1240 answer: at most, 1240 small bags can be made.
10: Mischievous bought 40 balloons and invited students to come home to compare and blow balloons. In order to divide the balloons equally, how many students should mischievous invite to compare and blow balloons? Mischievous does not participate
40 × 2 = 20 people 40 × 4 = 10 people 40 × 5 = 8 people 40 × 8 = 5 people 40 × 0 = 4 people 40 × 20 = 2 people answer: there are six ways to invite students: 20 people, 10 people, 5 people, 8 people, 4 people, 2 people. 11: a trapezoidal corn field, 15 meters above the bottom, 24 meters below the bottom, and 18 meters high, How many corn plants can be planted in this land? (15 + 24) x18 × 2 = 351 square meters, 351x9 = 3195 plants a: 3159 corn plants can be planted in this land. 12: the number of students in a class is less than 100. When they line up, there are just one more student in each row of 5, 4 and 3. How many students are there in this class? 5x4x3 = 60, 60 + 1 = 61 A: there are 61 students in this class
13: Wang Yue has a box of chocolates, 7, 5 and 3 at a time. How many chocolates are there at least? 7x5x3 = 105, 105 + 1 = 106 A: there are at least 106 chocolates in this box
14: Chenguang community has a 15 meter long, 1.2 meter wide rectangular corridor to be paved with square bricks. The designer has prepared 30 cm long square bricks, please calculate: how many such square bricks do you need? If each square brick costs 3 yuan, how much does it cost to pave this corridor?
15 meters = 150 decimeters, 1.2 meters = 12 decimeters, 30 centimeters = 3 decimeters, 150 X12 = 1800 square decimeters, 3 X3 = 9 square decimeters, 1800 ා 9 = 200 pieces, 200 X3 = 600 yuan. A: you need 200 pieces of square bricks, you need 600 yuan. 15: there are two parallelogram experimental fields with equal area, one is 70 meters long and 45 meters high, the other is 90 meters long, how many meters is the height?
70x45 = 3150 square meters 3150 × 90 = 35 meters answer: the height is 35 meters
16: A batch of steel pipes are stacked in a pile. There are 10 steel pipes at the bottom layer, one less at each upper layer, and five at the top layer. How many steel pipes are there? 10-5 + 1 = 6 layers (10 + 5) X6 × 2 = 15x6 × 2 = 90 × 2 = 45? A: there are 45 steel pipes in this batch

It can be written in letters_ According to the title_ List one___ ,

It can be written in letters_ Unknowns____ Find out the quantity according to the conditions in the title_________ List one_ Equation______ And then solve it

Form sentences
1.email,got,he,an,has,from,Jack,.
2.same,LineA,is,as,LineB,the,.
3.don't,why,give,her,a,football,you,
4.want,I,to,a,for,cousin,present,take,my,.

1.He has got an email from Jack.
2.LineA is the same as LineB.
3.Why don't you give her a football?
4.I want to take a present for my cousin.

Add a certain number to the numerator of 58 / 158, and subtract the same number from the denominator. The new fraction is reduced to 3 / 5 to find a certain number

Let a number be x, then: (58 + x): (158-x) = 3:5
（58+X）×5=（158-X）×3
Solution: x = 23

The poor is a kind of person. Is the predicate after it singular or plural?

The predicate verb is singular
eg.the poor is precocious for house holding.
The children of the poor are in charge early

Given vectors a and B, satisfying a * B, | a | = 1, | B | = 2, then | 2a-b|=

The conditions for a &; B are omitted
|2a - b| = √(2a - b)²
= √(4a² - 4a•b + b²)
= √(4∣a∣² - 4a•b + ∣b∣²)
= √(4*1² - 4a•b + 2²)
=Tick (8-4a &; b) (you can calculate its value by substituting the value of a &; b)

Be familiar with the following new words or phrases and fill in the blanks————————————
Send an e-mail: send an e-mail
Sigh up: Register: Register: write an e-mail: write an e-mail: send: send
Content of the passage:
Now let's learn to send an e-mail to your friend.First ,___ the 'New e-mail' button.Second ,_ .Then click on '____ ' .The message will go to your friend's computer.

Click on for the first space, write an e-mail for the second space, and send for the third space

Let the center of gravity of triangle ABC be g, and prove that Ag + BG + CG = 0 (there are arrows above AG, BG and CG)

When a = b = C, Ag + BG + CG + 0

Plural form of glass

glasses
Add es ending in S