The following functions are: 1) y = - X & # 178; 2) y = 2x; 3) y = - 1 / X; 4) y = x & # 178; (x < 0). The functions of Y decreasing with the increase of X are

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• 1. The function y = - 2x & # 178; - 4x + 5, when x = y increases with the increase of X
• 2. The function y = - 1 / 2 (x-1) ² + 2, when x takes what value, y increases with the increase of X? When x takes what value, y decreases with the increase of X? What I learned in the first semester of junior three, if there is a calculation process, it's better to list it When x takes what value, Y > 0, y < 0?
• 3. The following functions are known: 1. Y = 2x-1; 2. Y = - x; 3. Y = 4x; 4. Y = 2 / x, where are the positive proportion functions?
• 4. As shown in the figure: the straight lines a and B are perpendicular to the straight line L, and ∠ 1 = (2x) °, ∠ 2 = (3x + y) °, ∠ 3 = (2 & nbsp; Y-X) °, then the degree of ∠ 1 is______ ．
• 5. If the intersection of the line y = 3x-2 and y = - 2x + 3, the line y = 2x + K and the line y = - x + 4 intersect the X axis at the same point, then K=
• 6. Given that the point P is a moving point on the right part of the image of quadratic function y = - x ^ 2 + 3x, the line y = - 2x + B (b > 0) intersects the X axis and Y axis at two points CD respectively, If △ PCD with CD as right angle side is similar to OCD of triangle, the coordinates of P can be obtained
• 7. If the image of the line y = 3x + P intersects the X axis of the line y = - 2x + Q at the same point, the relation between P and Q is obtained P = q-5x (incorrect) Ask for a more accurate answer
• 8. If the image of the line y = 3x + P intersects the X axis of the line y = - 2 + Q at the same point, then the relation between P and Q is——————
• 9. If two figures are symmetrical about a line, they must be on both sides of the line. Why is it wrong
• 10. A figure consisting of two circles, two triangles, and two straight lines Thank you. If it's not enough, I'm offering a reward
• 11. Solution function y = x & # 178; - 2x - 1 = 0 Quick solution to one decimal
• 12. It is known that the image of positive scale function y = - 4x and inverse scale function y = K / X intersects at two points a and B. if the coordinate of point a is (x, 3), then the coordinate of point B is ()
• 13. If we know that the positive scale function y = - 4x and the inverse scale function y = K / X intersect two points a and B, and the coordinate of a is (X.4), then the coordinate of point B is. Is there a (M + 3, n) B (m, n) ab symmetrical about the axis of symmetry? I don't know how to explain it
• 14. It is known that the positive scaling function y = 4x and the inverse scaling function y = K / X When k is a value, the images of the two functions have two intersections? When k is a value, the images of the two functions have no intersection? Explain the reason,
• 15. We know that the positive scale function y = 4x and the inverse scale function y = KX. (1) what is the value of K? When k is a value, there is no intersection between the two functions? (2) Can there be only one intersection of the two functions? If yes, find out the coordinates of the intersection point; if not, explain the reason
• 16. If y = C + Z, y is the positive proportion function of X + 2, Z is the inverse proportion function of X, and x = 1, y = 1, find the relationship between Y and X
• 17. If y is a positive proportional function of Z, Z is an inverse proportional function of X, and X ≠ 0, then what is the functional relationship between Y and X? They say y = k1z, z = K2 / X y=k1k2/x Why is Z = 2K / x?
• 18. What are the scale coefficients of positive scale function and quadratic function? Y and X are directly proportional to the product of C. the proportional coefficient is K. y is represented by X
• 19. If the image of a positive scale function passes through points (2,4), then the analytic expression of the function is______ ．
• 20. Draw the following image of positive scale function: (1) y = 8x, (2) y = 2x out of 3, (3) y = - 2x out of 3 Draw the following image of positive scale function: (1) y = 8x, (2) y = 2x out of 3, (3) y = - 2x out of 3