The topic is not much about the essence. It is suggested to buy an extra-curricular book to do, and let parents or themselves see what is representative every day. Of course, do some difficult problems properly. If possible, let parents adapt the topics they have done and find another time to do them. Sometimes, there is no need to count how many courses you have taken. You can do three doors and ten doors. The key is that you understand, know and master the content of the class.
I wish you progress in your study and hope to adopt it!
The first volume of the first day of junior high school 150 math problems. God, I'm so tired. Most people don't spend a lot of time looking for so many math problems.
Forget it, let me make it up for you: let a, b and c be real numbers, and | A |+A = 0, | AB | = AB, | C |-C = 0, and find the value of the algebraic formula | b |-| a+b |-c-b |+| a-c |.
Landlord, you have to look at the time. If someone plagiarizes mine, you must not adopt it. Thank you!
Let's write math in the first volume of grade five. Everything in the first grade is quite simple. If you don't learn well in grade one, you won't know anything.
Math problem 1 after writing ①2X+Y = 5.
Write ② after1/2y-1/3x =-1.5.
Then multiply 2 by 6 to get 3Y-2X=-9 ③.
③ After that, move -2X+3Y=-9 ④.
After ④+①, 4Y=-4, that is, Y=- 1.
Bring Y=- 1 into ① to get 2X=6 X=3.
I can't answer the fifth question on page 68 of the first volume of primary school mathematics.
Kneel for the first book of math problems in the first day of junior high school, which can be found in Baidu library!
: wenku.baidu search? word = % C6 % DF % C4 % EA % BC % B6 % CA % FD % d 1% A7 & amp； lm = 1 & amp； od=0
The quadratic power of -2+the quadratic power of 3+the quadratic power of X (-2/3)-4 in the first volume of the first grade math problem.
=-4-4+9×(-2/3)- 16÷4
=-8-6-4
=- 18
Math Book 103 Page 65438 +02. 13. 15 How to do it? 12. Suppose A has x sheep, then B has (x-2) sheep.
X+ 1=2(x-2- 1)
x+ 1=2x-4-2
-x=-7
x=7
So b has x-2=5 sheep.
A has 7 sheep and B has 5 sheep.
13. the solution is x more than the original price.
( 1- 10%)( 1+x)= 1
0.9+0.9x= 1
0.9x=0. 1
x= 1/9
x≈ 1 1. 1%
So the sales volume will increase by 1 1. 1.
15. Solution:
Let the distance between a and b be x.
Both Party A and Party B are advancing at a high speed.
Speed and invariance
2 am to 10 am and 4 am to 12 am.
(Based on velocity and invariant countable equation)
According to the meaning of the problem in the equation
x-36/2=x+36/4
If you remove the denominator, you get 2(x-36)=(x+36).
Without brackets, you get: 2x-72=x+36.
Move this item, and you get 2x-x=36+72.
Merge similar items, x= 108.
A: The distance between A and B is108km.
It's a bit difficult to get the first volume of mathematics in Grade One (at least 10) 1. Xiao Wei and Xiaoming exchanged activities in the summer vacation. Xiao Wei said, "I attended the summer camp for science and technology and went out for a week. The sum of the dates of these seven days is 84. Do you know what date I left? " Xiao Ming said: "I stayed at my uncle's house for seven days during the holiday, and the date and number of months were also 84." Guess what date I went home? "
Solve Xiao Wei and Xiao Ming's problems with column equations ~
2. Cut two pieces with the same weight from two alloys with different copper contents, with the weight of 12kg and 8kg respectively, and melt each piece together with the remaining alloy. After smelting, the percentage of copper in the two pieces is the same. What is the weight of the cutting alloy?
3. There is a reservoir, which has a certain water flow per unit time and is also discharging water. According to the current flow rate, the water in the reservoir can be used for 40 days. Due to the recent rainfall in the reservoir area, the amount of water flowing into the reservoir has increased by 20%. If the discharged water volume is also increased by 10%, it can still be used for 40 days. Q: If the water is discharged according to the original discharge, how many days can it be used?
4. There are three classes, A, B and C. Class A has four more girls than Class B, and Class B has/kloc-0 more girls than Class C. If the first students of Class A are transferred to Class B, the first students of Class B are transferred to Class C at the same time, and the first students of Class C are transferred to Class A at the same time, the number of girls in the three classes is exactly equal. It is known that there are two girls in the first group of Class C. How many girls are there in the first group of Class A and Class B?
5. Uniformly arrange 1987 natural numbers 1, 2, 3, 4, ..., 1986, 1987 in a big circle, and count from 1 every 1. Cross out 5 and 6 every 4, so that two numbers are crossed out every other number, and the circle is crossed down. Q: How many numbers are left in the end?
6. Let 2002x3=2003y3=2004z3, x>0, y>0, z>0, and
3√2002 x2+2003 y2+2004 z2 = 3√2002 = 3√2003 = 3√
Found1/x+1/y+1/z.
7. There are two shepherds, each with X sheep. A said, B, if you give me a sheep, I will have twice as many sheep as you. B said, or if you give me one of your sheep, we will have the same number. How many sheep are there in A and B?
1 & gt； Question 1: Suppose the departure date is X.
X+X+ 1+X+2+X+3+X+4+X+5+X+6 = 84
X=9
Xiao Wei left on the 9th.
The second question: Because it is a summer vacation activity, it can only be held in July and August.
Set the date back to x.
rank
7+X+X- 1+X-2+X-3+X-4+X-5+X-6 = 84
or
8+X+X- 1+X-2+X-3+X-4+X-5+X-6 = 84
The first formula solves X= 14.
The result of the second formula is not an integer.
So I can only get home in July 14.
2> Let the copper content of the two blocks be M and N respectively, and the cutting quality be X..
Then [(12-x) m+xn]/12 = [(8-x) n+XM]/8 can directly solve x=4.8.
3> Let the total water volume of the reservoir be X, and the daily water inflow and water outflow are M and N respectively.
Then x/(n-m) = 40 = x/[n (1+10%)-m (1+20%)] needs x/[n-m( 1+20%)].
You can simplify n=2m x=40m and bring it into the second formula to get x=50 days.
There are m and n girls in the first group of Class 4>A and Class B respectively. If there are x girls in class C, there are x+ 1 in class B and x+5 girls in class A, with an average of x+2 (calculated by the number of changes). Class c:-2+n = (x+2)-X.
Class a: +2-m=(x+2)-(x+5) can get m=5 n=4.
5> Only 3k+ 1 remains in the first cycle. In the second cycle, you can change all the numbers into 3k+ 1, and then analyze k. Only 3p+2 is left in the second cycle, then P is analyzed, and so on, and the last number is 1987.
:czsx../sort.asp？ AClassID = 104 & amp； NClassID = 0 & ampGClassID=0
Square of 65438 +0. X-Y-X-Y Square Process
-the square of Mn+the square of 3n; The square of m-5mn = still matters.
It is known that the square of |m+n-2|+(mn+3) =0. Find the value of: 2(m+n)-3[2(m+n)-3mn].
Calculation: n 99.9 * n 99.8+n 199.9.
If ab>0, then | a | of a+| b |-AB | = of a.
(1) It is known that a-b=2, b-c=-3 and c-d=5. Find the values of (A-C), (B-D)/(A-D).
2. The number of girls in the seventh grade math interest group in a middle school is 2/3 less than that of boys. If the number of girls increases by 3 and the number of boys decreases by 65,438+0, then the number of girls is 3 more than that of the whole group of 65,438+0, and the number of the original mathematics interest group can be found.
3. Xiaoding rode a bike from home to Zhou Xiaojia, first went down the mountain at the speed of 12km/h, then walked a flat road at the speed of 9km/h, and arrived at Zhou Xiaojia in 55 minutes. When I came back, I crossed the flat road at a speed of 8km/h and went up the hill to go home at a speed of 4 km/h. * * It took 1.5h to find the distance between Xiaoding's house and Zhouxiao's house. \
4. There is a three-digit number, the sum of its digits is 16, and the decimal number is the sum of one digit and one hundred digits. If the hundred digits and one digit are reversed, the new number is 594 larger than the original number, so find the original number. (one yuan for one answer)
5. There are three digits, the sum of each digit is 16, and the decimal digit is the sum of one digit and a hundred digits. If the hundred digits and one digit are reversed, the new number is 594 larger than the original number, so find the original number. (one yuan for one answer)
There is a three-digit number, the sum of its digits is 16, and the decimal number is the sum of one digit and one hundred digits. If the hundred digits and one digit are reversed, the new number is 594 larger than the original number, so find the original number. (one yuan for one answer)
There is a three-digit number, the sum of its digits is 16, and the decimal number is the sum of one digit and one hundred digits. If the hundred digits and one digit are reversed, the new number is 594 larger than the original number, so find the original number. (one yuan for one answer)
Two pieces with the same weight, weighing 12kg and 8kg, were cut from two alloys with different copper contents, and each piece was melted together with the rest of the other alloy. After smelting, the percentage of copper in the two pieces is the same. What is the weight of the cut alloy?
A school has three classes: A class, B class and C class. Class A has 4 more girls than Class B, and Class B has/kloc-0 more girls than Class C. If the first students of Class A are transferred to Class B, the first students of Class B are transferred to Class C at the same time, and the first students of Class C are transferred to Class A at the same time, the number of girls in the three classes is exactly equal. It is known that there are two girls in the first group of Class C. How many girls are there in the first group of Class A and Class B?
Uniformly arrange 1987 natural numbers 1, 2, 3, 4, ..., 1986, 1987 in a big circle, and count from 1: every 1 crosses 2 and 3. Cross out 5 and 6 every 4, so that two numbers are crossed out every other number, and the circle is crossed down. Q: How many numbers are left in the end?
There are two shepherds, each with X sheep. A said, B, if you give me a sheep, the number of my sheep will be twice that of yours. B said: or you give me one of your sheep, and our number will be the same. How many sheep are there in A and B?
1 & gt； Question 1: Suppose the departure date is X.
X+X+ 1+X+2+X+3+X+4+X+5+X+6 = 84
X=9
Xiao Wei left on the 9th.
The second question: Because it is a summer vacation activity, it can only be held in July and August.
Set the date back to x.
rank
7+X+X- 1+X-2+X-3+X-4+X-5+X-6 = 84
or
8+X+X- 1+X-2+X-3+X-4+X-5+X-6 = 84
Xiao Wei and Xiaoming exchanged activities during the summer vacation. Xiao Wei said, "I attended the technical summer camp and went out for a week. The sum of the dates of these seven days is 84. Do you know what date I left? " Xiao Ming said: "I stayed at my uncle's house for seven days during the holiday, and the date and number of months were also 84." Guess what date I went home? "
Solve Xiao Wei and Xiao Ming's problems with column equations ~
First-year students have five questions in each chapter in Volume II. Thank you for your answers.