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The distance between the two places is 13 kilometers. Party A and Party B set out from the two places at the same time and walked towards each other. After 43 hours, they met? (solve by equation and arithmetic)
(1) A: car B travels 4.75 kilometers per hour. (2) suppose that car B travels x kilometers per hour. According to the meaning of the question, (5 + x) × 43 = 13, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 5 + x = 13 × 34, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp
M-N square + M-N square?
(m-n)^2+(m-n)^2=2(m-n)^2
Several math problems. The 2 after the letter is the square
(A+B)2-2(A+B)C+C2
Given A2 + b2-a + 4 and 4 / 1 = 0, find the value of a and B
It is known that a, B and C are the lengths of three sides of the triangle ABC respectively. Try to explain the square of (A2 + b2-c2) - 4A and the square of B
In the first question, (a + b) "- 2 (a + b) C + C", isn't this the form of complete square, a "- 2Ab + B" = (a-b)? So (a + b) "- 2 (a + b) C + C" = (a + B-C) "in the second question, do you write" four and a quarter "? In the fraction, the numerator is equivalent to the divisor, the denominator is equivalent to the divisor, and the fraction line is oblique
Given a = a3-3a2 + 2a-1, B = 2A2 + 2a2-4a-5, find 3A - (2B + 2 / a-b)
The letter is followed by a square
Original formula = 3a-2b-a / 2 + A / 2
=(5A-3B)/2
=[5(a3-3a2+2a-1)-3(2a3+2a2-4a-5)]/2
=(5a3-15a2+10a-5-6a3-6a2+12a+15)/2
=(-a3-21a2+22a+10)/2
3A (2a2-4a) - 2A2 (3a + 4), where a = - 1
The original formula = 3A (2a2-4a) - 2A2 (3a + 4) = 6a3-12a2-6a3-8a2 = - 20a2 when a = - 1, the original formula = - 20a2 = - 20 * (- 1) 2 = - 20
(6-2a2) + (4 + 3a) 2 simplification
It's (6-2a) & 178; + (4 + 3a) & 178; simplification
（6-2a）²+（4+3a）²
=4a²-24a+36+9a²+24a+16
=13a²+52
3a2+2a2-(2a2-2a)+(3a+a2)
3a2+2a2-(2a2-2a)+(3a+a2)
=3a2+2a2-2a2+2a+3a+a2
=(3+2-2+1)a2+(2+3)a
=4a2+5a
(A2-1) / (A2 + 2A + 1) divided by (a2-a) / (a + 1) (A-2 / (a + 3) divided by (A2-4) / (A2 + 6A + 9)
(A2-1) / (A2 + 2A + 1) divided by (a2-a) / (a + 1) (A-2 / (a + 3) divided by (A2-4) / (A2 + 6A + 9) = (A & # 178; - 1) / (A & # 178; + 2A + 1) × (a + 1) / (A & # 178; - a) × (A-2) / (a + 3) × (A & # 178; + 6A + 9) / (A & # 178; - 4) = (a + 1) / (a + 1) & # 178
Calculation: a − 2A + 3 △ A2 − 4a2 + 6A + 9
The original formula is a − 2A + 3 × (a + 3) 2 (a + 2) (a − 2) = a + 3A + 2
First simplify: (4-a2 / A2 + 6A + 9) - (A-2 / 2A + 6) + 2, and then choose a person you like from several generations to seek the help of God
The title is this: (4-A) / (a + 6A + 9) / (A-2) / (2a + 6) + 2 (4-A) / (a + 6A + 9) / (A-2) / (2a + 6) + 2 = - (a + 2) (A-2) / (a + 3) / (A-2) / 2 (a + 3) + 2 = - (a + 2) (A-2) / (a + 3) × 2 (a + 3) / (A-2) + 2 = - 2 (a + 2) / (a + 3) + 2 if a = - 2, - 2 (a + 2) / (a + 3) + 2 = 2
RELATED INFORMATIONS
- 1. If ma2 − b2-2ab − b2a2 − B2 = a − Ba + B, then M=______ ．
- 2. If two unequal real numbers m, n satisfy m * 2-2m = a, n * 2-2n = a, m * 2 + n * 2 = 5, then the value of real number a is?
- 3. It is known that two real roots of the equation (A2-1) X2 - (a + 1) x + 1 = 0 about X are reciprocal to each other, then the value of a is___ ．
- 4. Mathematical problems with binary linear equations In football league matches, three points are gained from winning one game, one point is gained from drawing one game, and zero point is gained from losing one game. A certain team has six points in four games. How many times does the team win, draw or lose?
- 5. The first chapter of mathematics test paper In the rational number test paper of the first chapter of mathematics of the first grade of the people's education press, we need more four mixed operation questions of rational numbers, and we'd better attach the answers, No, it's a test paper
- 6. Fill in the blanks in the first day of junior high school 1. When the relation between the dependent variable y and the independent variable x is expressed by the relation, the dependent variable y should be written at the end of the equation_____ edge 2. In the variable relation, the value of independent variable should be algebraic_____ It should also be considered in practical problems_____ 3. In the variable relation, for each determined value of the independent variable, the dependent variable has_____ The determined value corresponds to it 1. There are three ways to reflect the relationship between dependent variables and independent variables_____ 、_____ And_____ 2. When using image to represent the relationship between dependent variable and independent variable, it is usually necessary to draw two lines which have common origin and interact with each other_____ The number axis in the horizontal direction is called_____ The number axis in the vertical direction is called_____ 3. In the relationship image between variables, if you want to obtain the value of the dependent variable y when the independent variable x = a, the method is: in the_____ Find the point a on the axis that represents the number a, and then draw through the point a_____ Salivate, cross the image to point P, and then draw after point P_____ The vertical line of the axis intersects_____ If the axis is at point B, then point B is at_____ The number corresponding to the axis is the value of the dependent variable y
- 7. If 5 / 7a ^ (K + m) B ^ m and a ^ (K + 2) B ^ 2 are of the same kind, and K is a non negative integer, then k = ()
- 8. How to use the substitution method to solve binary linear equations,
- 9. (x-4) square-21 = 6x is changed into the general form, where the coefficient of the second term is; the coefficient of the first term is; the constant term is; the coefficient of the second term is; the coefficient of the first term is;
- 10. Substituting the five steps of elimination method, adding and subtracting the five steps of elimination method
- 11. 1. Among the four teams of the sixth grade love team, there are 23 people in the first and second teams. The number of the second, third and fourth teams is 8 / 23 more than the total number of the first and second teams. It is known that the second team accounts for 1 / 5 of the total number of the team. How many people are there in the sixth grade love team? 2. It takes 15 days for team a to build a section of road, while team B can build 44 meters a day. When the two teams finish the road together, team a has built 60% of the total length of the road. How many meters is the total length of the road?
- 12. Math problems (3) 1、 A and B are 100 meters apart, walking at the speed of 2 meters per second and 3 meters per second respectively. At the same time, a's dog runs to B at the speed of 8 meters per second. The dog runs back to a after meeting B, and runs back to B after meeting a, and then runs back to B after meeting A. this cycle, until a and B meet, how many meters has the dog run? 2、 Law finding calculation 1*2*3+2*4*6+...+100*200*300 ——————————————————=? 2*3*4+4*6*8+...+200*300*400 ("-" is a fractional line) 3、 Fill - 15, - 12, - 9, - 6, - 3,0,3,6,9 in the nine palace Make the sum of three numbers of horizontal, vertical and diagonal equal Please hurry. Speed! Even if only one question!
- 13. In the rational number m, N, P satisfy When the rational numbers m, N, P satisfy that the absolute value of M divided by m plus the absolute value of N divided by N plus the absolute value of P divided by P equals 1, find the value of 2mnp divided by 13mnp1 Calculate 1 and 1 / 2 minus 2 and 5 / 6 plus 3 and 1 / 12 minus 4 and 19 / 20 plus 5 and 1 / 30 minus 6 and 41 / 42 plus 7 and 1 / 56 minus 8 and 71 / 72 plus 9 and 1 / 90
- 14. As shown in the figure, the height of the inclined plane is 1m and the length is 3M. The worker pushes the 840n box onto the car with 400N force along the inclined plane. What is the useful work done by the worker in this process___ J. What is the mechanical efficiency___ %If the slope is smooth, the required thrust is___ N．
- 15. A moving pulley is used to lift an object with a weight of 200N upward for 3M within 5S, and the pulling force is 150n. What is the mechanical efficiency of the moving pulley? What is the power of the pulling force?
- 16. Calculation: (3m + 3n) (3m-3n) - (3m + 3n) ^ 2 + (3m-2n) ^ 2
- 17. If the quadratic y of 4x and the m-th power of - 2x and the n-th power of Y are of the same kind, then M-N =? Look at the title
- 18. Simplification: (- 2A) × a - (- 2A) & # - 178; the result is a.0 b.2a & # - 178; C. - 6A & # - 178; D. - 4A & # - 178
- 19. Given a + B = 2, ab = 3, find 1A ^ 3b of 2 + A ^ 2B ^ 2 + 1ab ^ 3 of 2
- 20. The algebraic expression (m-n) 2 can be interpreted as______ ．