![](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>)
A piece of iron wire is m decimeter long. It is used to form a square and a circle. The square area is () A. 1 / 2 B.2 times C. π / 4 D.4 π times
Choose C
S positive = (M / 4) &# 178;
S circle = (M / 2 π) &# 178; π
S positive / s circle = (M / 4) & # 178; / [(M / 2 π) & # 178; π] = π / 4
Let the bivariate linear equation 2x-3y = 3 be expressed as y by the formula containing X
As a result, x =? Y =?, urgent
x=(3y+3)/2
y=(2x-3)/3
It is known that the bivariate linear equation 2x-3y = - 15.1 'denotes x with the formula containing y. 2' denotes y with the formula containing X
The quadratic equation 2x-3y = - 15 is known
1 denotes x with a formula containing y
2 denote y with a formula containing X
x=1.5y-7.5
y=2x/3+5
RELATED INFORMATIONS
- 1. Binary linear equations 2x-5y plus 3 equals 0ax-y = 7
- 2. The solution is 0.5 out of 6
- 3. Solution ratio: 1 / 2: 1 / 4: X
- 4. (1.25 + x): 0.25 = x: 1.6 solution ratio
- 5. 4 / x = 5 / 80 7.2:12 + 9 / 1: x 2.5 + 6 / 15.6:2.88 + 2.6: X solution ratio
- 6. 6.5: x = 0.5:4 X: 0.42 = 7:21 1 / 8:1 / 6 = 1 / 10: x 6 / 2.5 = x / 3 3 / 2:1 / 3 = x: 8 x: 9 / 2 = 1 / 3:2 (solution ratio) 6.5: x = 0.5:4 X: 0.42 = 7:21 1 / 8:1 / 6 = 1 / 10: x 6 / 2.5 = x / 3 3 / 2:1 / 3 = x: 8 x: 9 / 2 = 1 / 3:2 (solution ratio)
- 7. Solution ratio (X: 12 = 0.5:1 / 3)
- 8. The solution ratio is 2.25 of x = 3.75 of 2, 11 of 12:5 of 4 = 35 of 36:x
- 9. List the proportions according to the conditions, and find out that the ratio of 8 / 9 to X is equal to 6 and the ratio of 3 / 4 to 9 List the proportion according to the condition and solve the proportion The ratio of eight ninths to X is equal to the ratio of six to three fourths By 9:00
- 10. The ratio of X to 3 / 4 is equal to the ratio of 8 to 1.2
- 11. 1. The equation (2x + 1) - (y + 3) = x + y is transformed into a formula containing x to express y, and the corresponding values of Y are obtained when x = - 2,0.1, two fifths respectively 2. Write a group of integer solutions, a group of negative integer solutions and a group of positive integer solutions of the quadratic equation 4x-3y = 15 (add 20 points to the formula)
- 12. Solving X-Y = 500 and X + 15 ‰ X - [Y-10 ‰ y] = 950 by the method of adding, subtracting and eliminating elements of binary linear equations
- 13. In the bivariate linear equation x + 6y-4 = 0, when x is equal to 4, how much is y; when y = - 1, how much is x?
- 14. Bivariate linear equation: X / 3-y / 4 = x / 2 + Y / 3-10 = 3 (with process) There is another problem: when solving the equations {ax + by = 26, the correct solution is {x = 4) cx+y=6 y=-2 Because Xiao Ming wrongly wrote C, the solution is {x = 7} y=3 The correct values of Qiu a, B, C When {ax + by = 26 CX + y = 6, {x = 4, y = - 2 And the above question!
- 15. The inverse scale function y = - 2 / x, when x is greater than 2, the value range of Y is --- when x is less than or equal to 2, the value range of Y is --- when 1 is less than or equal to X
- 16. Given the first-order function y = KX + B, when 0 ≤ x ≤ 2, the value range of the corresponding function value y is - 4 ≤ y ≤ 8, then the value of KB is______ ．
- 17. On the function y = KX + B (k, B are not equal to 0 constant), the following statement is correct () A. Y is proportional to X. B. y is proportional to KX. C. y is proportional to x + B. D. y-b is proportional to X
- 18. When - 3 ≤ x ≤ 1, the corresponding value of Y is 1 ≤ y ≤ 9, then the value of KB is 1______ ．
- 19. The first-order function y = KX + B, when x = 4, y = 9; when x = 6, y = 3, what is k What is the value of y when x = 1
- 20. The straight line y = KX + B is parallel to the straight line y = - 2 / 3 * x + 5, and the function expression of the straight line can be obtained by passing through the point a (0, - 3) (1); (2) the straight line can be generated by the straight line The straight line y = KX + B is parallel to the straight line y = - 3 / 2 * x + 5 and passes through point a (0, - 3) (1) Find the function expression of the line; (2) How to translate the line y = - 2 / 3 * x + 5?