If a is known to be a real number, the absolute value of A. a B. - a C. A and the absolute value of D. negative a must be nonnegative
A nonnegative number is greater than or equal to 0, so choose C
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- 1. When the moving point a moves on the square of the circle x + the square of the circle y = 1, the trajectory equation of the midpoint of the line between the moving point a and the fixed point B (- 3,0) is
- 2. When the moving point a moves on the circle x2 + y2 = 1, the trajectory equation of the midpoint of its line with the fixed point B (3,0) is () A. (x+3)2+y2=4B. (x-3)2+y2=1C. (2x-3)2+4y2=1D. (x+3)2+y2=12
- 3. When the moving point a moves on the circle x2 + y2 = 1, the trajectory equation of the midpoint of its line with the fixed point B (3,0) is () A. (x+3)2+y2=4B. (x-3)2+y2=1C. (2x-3)2+4y2=1D. (x+3)2+y2=12
- 4. When a moving point P moves on the circle x 2 + y 2 = 1, the trajectory equation of the midpoint m connecting it with the fixed point a (3,0) is obtained
- 5. When the moving point a moves on the circle x2 + y2 = 1, the trajectory equation of the midpoint of its line with the fixed point B (3,0) is () A. (x+3)2+y2=4B. (x-3)2+y2=1C. (2x-3)2+4y2=1D. (x+3)2+y2=12
- 6. Application of circle and equation The chord length of line L: 2x-y-2 = 0 cut by circle C: (x-3) & sup2; + Y & sup2; = 9
- 7. The equation of line and circle in high school mathematics In a triangle, the opposite sides of angle a, angle B and angle c are known to be a, B and C respectively, and a > C > b is an arithmetic sequence, | ab | = 2. The trajectory equation of the vertex is obtained
- 8. High school mathematics problems - the equation of line and circle The linear equation passing through point P (- 1,2) and parallel to the tangent of curve y = 3x ^ 2-4x + 2 at point (1,1) is?
- 9. On the equation of line and circle Given that a = {(x, y) | X-Y + 2 = 0}, B = {(x, y) | (x-t) ^ 2 + (Y-1) ^ 2 = 2}, and a intersection B is not equal to an empty set, then the value range of T is
- 10. If | ab | = 8, then the equation of line L is () A. 5x + 12Y + 20 = 0b. 5x-2y + 20 = 0C. 5x + 12Y + 20 = 0 or x + 4 = 0d. 5x-2y + 20 = 0 or x + 4 = 0
- 11. Why? A. the real number - A ^ 2 is negative. B. the following sign (a ^ 2) = absolute value a The following statement is correct. Why? A. The real number - A ^ 2 is negative B. Follow sign (a ^ 2) = absolute value a C. The absolute value of - a must be positive D. The absolute value of real number - A is a
- 12. The value range of real number m is the equation x ^ + (m-1) x + 2m + 6 = 0 Find the range of the real number m so that the equation x ^ 2 + 2 (m-1) x + 2m + 6 = 0, (1) There are two real roots, one is greater than 2 and the other is less than 2; (2) Both solid roots are larger than 1; (3) Two real roots x1, X2 satisfy 0
- 13. Find the range of the real number m so that the equation x & # 178; + 2 (m-1) x + 2m + 6 = 0 (1) There are two real roots, one larger than 2 and the other smaller than 2 (2) There are two real roots, and both are larger than 1 (3) There are two real roots α and β, and 0 < α < 1 < β is less than 4 (4) At least one positive root
- 14. Given that x = 1 / 2 is the solution of the equation 2x-m / 4-1 / 2 = x-m / 3, find the value of 1 / 4 (- 4m & # 178; + 2m-8) - (1 / 2m-1)
- 15. Which is a quadratic equation with one variable I remember the teacher said that unknowns can't be denominators, which is a quadratic equation? The square of x = - 4 The square of x-x / 1 = 4 Which one?
- 16. There is a point P (m, n) on the image of the inverse scale function y = K / * (k not = 0), whose coordinates are the two roots of the quadratic equation t square-3t + k = 0 with respect to t The distance from the point P to the origin is the root 13, so the analytic expression of the inverse scale function is the process of writing out the solution
- 17. The image of the first-order function y = x + B intersects with the image of the inverse scale function y = K + 3 / X at point a (m, n), and m, n (m, n) is a quadratic equation of one variable with respect to X Two unequal real roots of KX ^ 2 + (2k-7) x + K + 3 = 0, where k is a non negative integer and m and N are constants (1) Finding the value of K (2) Find the coordinates of point a and the analytic expression of first-order function
- 18. The inverse scale function y = K / X has a point P (m, n) on the image whose coordinates are the two roots of the quadratic equation T2 (square) - 3T + k = 0 with respect to t Why m + n = 3
- 19. There is a point P (m, n) on the image of the inverse scale function y = K / x, whose coordinates are two roots of the quadratic equation T2 (square) - 3T + k = 0 with respect to t And the distance from P to the origin is the root sign 5 How to get m + n = 3 How to get m + n = 3 How to get m + n = 3 How to get m + n = 3 How to get m + n = 3
- 20. It is known that the equation MX2 - (2m-1) x + M = 0 has two unequal real roots. (1) find the value range of M; (2) find the two roots of the equation when m is the largest integer