![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
50 simplified evaluation problems
Simplify evaluation
3.3ab-4ab+8ab-7ab+ab=______ .
4.7x-(5x-5y)-y=______ .
5.23a3bc2-15ab2c+8abc-24a3bc2-8abc=______ .
6.-7x2+6x+13x2-4x-5x2=______ .
7.2y+(-2y+5)-(3y+2)=______ .
11.(2x2-3xy+4y2)+(x2+2xy-3y2)=______ .
12.2a-(3a-2b+2)+(3a-4b-1)=______ .
13.-6x2-7x2+15x2-2x2=______ .
14.2x-(x+3y)-(-x-y)-(x-y)=______ .
16.2x+2y-[3x-2(x-y)]=______ .
17.5-(1-x)-1-(x-1)=______ .
18.( )+(4xy+7x2-y2)=10x2-xy.
19.(4xy2-2x2y)-( )=x3-2x2y+4xy2+y3.
21. Given a = x3-2x2 + x-4, B = 2x3-5x + 3, calculate a + B=______ .
22. Given a = x3-2x2 + x-4, B = 2x3-5x + 3, calculate a-b=______ .
23. If a = - 0.2, B = 0.5, the value of the algebraic formula - (| A2B | - | AB2 |) is______ .
25. Subtract 3m4-m3-2m + 5 from a polynomial to get - 2m4-3m3-2m2-1, then the polynomial is equal to______ .
26.-(2x2-y2)-[2y2-(x2+2xy)]=______ .
27. If - 3a3b2 and 5ax-1by + 2 are of the same kind, then X=______ ,y=______ .
28.(-y+6+3y4-y3)-(2y2-3y3+y4-7)=______ .
29. The result of simplifying the algebraic expression 4x2 - [7x2-5x-3 (1-2x + x2)] is______ .
30.2a-b2+c-d3=2a+( )-d3=2a-d3-( )=c-( ).
31.3a-(2a-3b)+3(a-2b)-b=______ .
32. The reduced algebraic formula X - [y-2x - (x + y)] is equal to______ .
33.[5a2+( )a-7]+[( )a2-4a+( )]=a2+2a+1.
34.3x-[y-(2x+y)]=______ .
35. Simplify | 1-x + y | - | X-Y | (where x0) is equal to______ .
36. It is known that x ≤ y, x + Y - | X-Y|=______ .
37. Known x
Mathematics: calculation problems and simplified evaluation
（1）（9a^3b^2-12a^2b^3+3ab^4）/(-1/2ab)
(2) Simplify the evaluation 3A ^ 2B (2Ab ^ 3-A ^ 2B ^ 3-1) + 2 (AB) ^ 4 + A * 3AB, where a = 2, B = 3
I've worked out the answer. Check it. (1) - 18a ^ 2B + 24ab ^ 2-6ab ^ 3 (2) 2592
（3）[(a-b)^4-(a-b)^3]÷(b-a)^3
（4）(a-b)^11÷(b-a)^10+(-a-b)^5÷(a+b)^4
Come on!
The first question, the last one a, 6b ^ 3
The second question is right
Linear equation of one variable, application problems
The fast horse walks 240 Li every day. The slow horse walks 150 Li every day. The slow horse walks 12 days first. How many days can the fast horse catch up with the slow horse?
The track of the sports ground is 400m long. Xiaojian practices cycling, with an average of 350m per minute. Xiaokang practices running, with an average of 250m per minute. They start from the same place at the same time. How long does it take for them to meet for the first time? And how long does it take for them to meet again?
There are a group of pigeons and some pigeon cages. If 6 pigeons live in each pigeon cage, the remaining 3 pigeons have no pigeon cages to live in. If another 5 pigeons fly in, together with the original pigeons, each pigeon cage just houses 8 pigeons. How many pigeons and pigeon cages are there?
Let the fast horse catch up with the slow horse in X days, 240x-150x = 150 × 12, and the solution is x = 20
Let's first meet in X minutes, 400X + 350x = 400, and get x = 8 / 15 minutes = 40 seconds. From this, we know that they meet every 40 seconds, and then they can meet again in 40 seconds
With X pigeon cages, the original pigeon number is 6x + 3, 6x + 3 = 8x-5, and the solution is x = 4, the original pigeon number is 6 × 4 + 3 = 27
Classification and collection of the application problems of one variable linear equation in Grade 7
Give me some application questions, fill in the blanks and multiple-choice questions for one yuan in the first volume of Grade 7, and help me analyze them. Tell me how to get there
1. Once again in the math test, the teacher gave 25 multiple-choice questions, each question has four options, and only one option is correct, the teacher's scoring standard is: answer a question correctly to give 4 points, do not answer or answer a wrong question to deduct 1 point, ask: (1) a classmate got 90 points, how many questions did this classmate answer correctly? (2) a classmate got
How can cos60 ° cos10 ° / cos50 ° = cos10 ° sin50 ° / 2sin50 ° cos50 ° come out
Cos 60 ° = 1 / 2 take it in... And it's out
The difference between polynomial x ^ 2 + ax-y and BX ^ 2-3x + 6y-3 has nothing to do with the value of letter X. what is the value of a and B?
(x^2+ax-y+b) - (bx^2-3x+6y-3)
= (1-b)x^2+(a+3)x-.
The value of the difference is independent of the letter X:
1-b=0,a+3=0
a=-3,b=1
Potato power group answers questions for you
If you don't understand this question, you can ask,
Grandfather Liu has 160 ducks, and the number of chickens is five eighths of that of ducks. How many more ducks are raised than chickens?
160 divided by 8 times 5 = 100
160-100 = 60, that's it!
What is tan2 / π
2 / π?
Or two Pi?
If it's 2 / π, it won't be involved. Even if the answer is this, just write 2 / π
The π of Tan 2 is meaningless, that is, it doesn't exist
The quadratic function y = x ^ 2-5x + 4 is known
(1) Draw a function image and find its vertex coordinates and axis of symmetry
(2) Observe the image answer: when does the value of Y increase with the increase of the value of X, and when does the value of Y decrease with the increase of the value of X?
(3) If you translate the image of y = x ^ 2-5x + 4 three unit lengths to the left and then four unit lengths to the down, try to determine the analytical formula of the parabola
(4) Let the parabola in (3) intersect with the x-axis at two points a and B. try to determine a point P on the parabola below the x-axis to maximize the area of △ PAB
1) Formula, y = (X-5 / 2) ^ 2 + 4-25 / 4 = (X-5 / 2) ^ 2-9 / 4
The vertex is (5 / 2, - 9 / 4),
The axis of symmetry is x = 5 / 2
Image Brief
2) When x > 5 / 2, the value of Y increases with the increase of X,
When x
If point a (m, - 3) is shifted to the left by 3 units of length, and the obtained point is symmetric with point a about the Y axis, what is the value of M
a.3 b.3/2 c.-3/2 d.-3
b
RELATED INFORMATIONS
- 1. Four mixed arithmetic problems of rational numbers in Grade 7, To 80 is enough, the best is original, because I basically find online almost, ha ha In addition, there should be four items: addition, subtraction, multiplication and division. There can be less addition and subtraction, but there must be multiplication and division, and there must be negative numbers, Come on, before school starts Of course, the more the better
- 2. Chapter 2: addition and subtraction of integral, 2
- 3. Analysis of the difficult problem of addition and subtraction of integral form in volume one of grade seven
- 4. Integral addition, subtraction, multiplication and division calculation problems and answers, the more the better! Is a calculation problem! Power operation can also be
- 5. An applied problem of a system of linear inequalities in elementary two variables Cement is transported by several 8-ton trucks. If each truck is loaded with 4 tons, then 20 tons of cement is left. If each truck is loaded with 8 tons, then the last truck is not empty. To find out the quantity of cars and cement, we need to list a one yuan inequality system
- 6. Give a box of apples to several children. If each child is given 5 apples, there are 12 apples left. If each child is given 8 apples, the last child gets 8 apples, but there are less than 8 apples. Find the number of children and the number of apples in this box
- 7. Help me solve a problem. It's a system of linear inequalities. Thank you In the equations 2x + y = 1-m and X + 2Y = 2, if the unknown x y satisfies x + Y > 0, the value range of M is obtained? Pay attention to the whole process
- 8. On the system of linear inequalities of one variable 1、 In the system of equations {2x + y = 1-m, if the unknowns X and y satisfy X-Y < 0, then the value range of M is———— x+2y+2 2、 If the solution set of inequality system {x-a ＞ 2 is - 1 ＜ x ＜ 3, then a = -, B=___ x-b＜1 3、 Box 700 pieces of products. If 15 pieces are packed in each box, more than 3 boxes of products can not be packed. If 20 pieces are packed in each box, at least 8 boxes are left. Calculate the number of boxes. (the solution of the formula) 4、 Given that the solution X and y of the system {2x + y = 5m + 6 are all positive numbers, the value range of M is obtained. x-2y=17
- 9. 50 trace system of linear inequalities in one variable Don't apply questions
- 10. To solve the problem of the system of linear inequalities of one variable, we must calculate it Example: 5x + 2 > 5 9x+6
- 11. It needs 20 ways of simplification, 20 ways of rational number calculation and 20 ways of solving equations And I'm in grade one I forgot to ask for an answer. Don't risk an answer
- 12. There are 50 problems in the operation of rational numbers, 50 problems in solving equations, and 30 problems in simplifying evaluation,
- 13. Application problem: quadratic equation of two variables A shop decoration, if a, B two Decoration Group Construction at the same time, 8 days can be completed, need to pay two groups of 3520 yuan; if first ask a group to do alone for 6 days, and then ask B to do 12 days can be completed, need to pay two groups of fees, a total of 3480 yuan?
- 14. Solving the application problem of binary linear equation There is only one car for a class to go for an outing in Beishan Mountain 18 kilometers away, which is divided into two groups. Group A takes the car first, group B walks, and the car goes to A. group A gets off the car and walks, and the car returns to group B. the last two groups arrive at Beishan Mountain at the same time. The known speed of the car is 60 km / h, and the walking speed is 4 km / h? Please set two unknowns
- 15. Elementary two's one variable one degree inequality application question A rectangular plot is 8 meters wide and less than 50 meters in circumference, with an area of at least 120 meters square Find the value range of the length of the rectangle
- 16. On the system of linear inequalities of one variable in the second grade of junior high school mathematics Give a basket of oranges to several children. If each child gets 4 oranges, there will be 9 oranges left. If each child gets 6 oranges, the last child gets less than 3 oranges. How many oranges are there?
- 17. (hard) A bucket of 30 liters of pure alcohol, pour out a number, fill it with water, and then pour out the same volume, leaving 4.8 liters of pure alcohol. How much pure alcohol is poured out each time? It's a series of equations,
- 18. Solving a mathematics problem in grade two of junior high school In a village, m HA is planted, and the total yield of corn is n kg; the rice planting area is p ha more than the corn planting area, and the total yield of rice is 2 times more than that of corn. Q kg is used to write the formula of unit area yield of corn and rice [unit; kg / HA]. If the denominators of the two formulas are different, the two formulas are divided
- 19. Solving applied problems of linear inequalities with one variable A company purchased 40 sets of air conditioners and 60 sets of refrigerators, and allocated them to its two subordinate shopping malls for sale, 70 sets in shopping mall a and 30 sets in shopping mall B. the profits of two kinds of electrical appliances sold by the two shopping malls are as follows: (unit: yuan) Air conditioning refrigerator Department store a 200 170 Shopping mall B 160 150 (1) The company supplies x air-conditioners to a shopping mall. The total profit of the two shopping malls after buying all the electrical appliances is expressed by the algebraic formula of X, and the value range of X is calculated (2) In order to promote the sales, the company decided to give a profit of a yuan to each air conditioner in a shopping mall, but the profit of each air conditioner should not be less than the profit of each refrigerator in a shopping mall?
- 20. An applied problem of binary linear equations The father gave his son a question and asked him to guess the answer. He said that there was a mother and daughter. Five years ago, the mother's age was 15 times the daughter's; 15 years later, the mother's age was more than twice the daughter's. 6. What's the age of the mother and daughter now?