![](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>)
2.5x-4.5 = 3x + 5.5 urgent and checking calculation
2.5x-4.5=3x+5.5
3x-2.5x= -4.5-5.5
0.5x= -10
x= -20
Test: substitute x = - 20 into the equation
Left = right
So x = - 20 is the solution of the equation
3x+12=3.5x
solve equations
12=0.5x
x=24
The equation of 3x-1 / 4 = 5x-7 / 6
Fast
3x/4-1=5x/6-7
9x-12=10x-14
x=2
RELATED INFORMATIONS
- 1. 5x＋3x＋6×1.5=
- 2. 5X-1/5=0.2+3X 3(6x-7)=15x+12 5(x-8)=3x The average score of the 10 contestants is 82, the average score of the first six is 83, and the average score of the last six is 80. Then the average score of the fifth and sixth contestants is () points Xiao Ming goes to climb the mountain. When he goes up the mountain, he travels 3 kilometers per hour. When he returns from the original road, he travels 5 kilometers per hour. The average speed of Xiao Ming's round trip is () The average of 3 is ABC, the average of 10 is CDE, the average of 7 is ABCDE. C is () 5X-1/5=0.2+3X 3(6x-7)=15x+12 5(x-8)=3x
- 3. 1-4 / 4 4-3x = 6 / 5x + 3-x process More complete
- 4. Let K be an integer and the solution of the equation KX = 6-2x about K be a natural number to find the value of K
- 5. If the solution of the equation 9x-2 = KX + 7 of X is a natural number, then the value of integer k is______ ．
- 6. It is known that the solutions of the equations 4x + 2A = 3x + 1 and 3x + 2A = 6x + 1 are opposite to each other?
- 7. It is known that the values of formula 2A + 7 and 1-A are opposite to each other. Solve the equation 4-2a = 3x-1 about X
- 8. Given that points a (x1, Y1) and B (X2, Y2) are two moving points on the circle C1: (x-1) &# 178; + Y & # 178; = 4, O is the origin of coordinates and satisfies the vector OA * ob = 0, The circle whose diameter is ab is C2 (1) If the coordinate of point a is (3,0), find the coordinate of point B (2) Finding the trajectory equation of the center C2 (3) Finding the maximum area of circle C2
- 9. As shown in the figure, it is known that the edges OA, OB and OC of o-abc are perpendicular, and OA = 1, OB = OC = 2, e is the midpoint of OC Find the sine value of the angle between the line be and the plane ABC. ② find the distance between the point E and the plane ABC
- 10. If there is a point O in the plane of △ ABC, and OA * ob = ob * OC = OC * OA, then point O is the () center of △ ABC
- 11. Simplify (- 2) (- 2) ^ 2012 + (- 2) ^ 2013 + (- 2) ^ 2014
- 12. On the equation of X, does the square of X + 2aX + a = 4 have two unequal real roots? Why?
- 13. When k is an integer, the equation (K & sup2; - 1) x & sup2; - 6 (3K-1) x + 72 = 0 has two unequal positive integers?
- 14. When k is an integer, the equation (K & # 178; - 1) x & # 178; - 6 (3K-1) x + 72 = 0 has two unequal positive integer roots? Good bonus points to write, the process is urgent!
- 15. F (x) = lgx image and 10 x power image
- 16. How to find the power function in MATLAB, such as the nth power of 0.9, n = [- 5:5]
- 17. Given f (x) = SiNx, f (g (x)) = 1-x ^ 2, find the expression of G (x)
- 18. The solution of the equation SiNx / 2 = 1 / 3 in [π, 2 π] x =?
- 19. The proof of X & sup2; + (K + 2x) + 2K = 0, no matter K takes any real number, the root of the square is also a real number
- 20. On the sum of two real number roots of X equation x & sup2; + 2 (K + 1) x + K & sup2; = 0 is m, and on the inequality system Y > - 4, y