It is known that the eccentricity of ellipse C: x ^ 2 / A ^ 2 + y ^ 2 / b ^ 2 = 1 (a > b > 0) is 1 / 2, the distance from the right focus to the straight line X / A + B / y = 1 d = √ 21 / 7, and O is the coordinate origin The equation of finding ellipse

RELATED INFORMATIONS

• 1. Solve the linear equation of point a (- 3,2) and the distance from the origin is 3
• 2. The curve C is a set of points whose product of the distances from two straight lines X + y = 0 and X-Y = 0 is 1. The trajectory equation of C is obtained
• 3. "A = 3 or a = - 2" is the () condition that the line ax + 2Y + 3A = 0 and the line 3x + (A-1) y = A-7 are parallel and not coincident A. Sufficient and unnecessary B. necessary and not sufficient C. sufficient and necessary D. neither sufficient nor necessary
• 4. If the center of circle C is on the straight line 5x-3y = 8 and circle C is tangent to two coordinate axes, the equation of circle C is
• 5. The equation of a circle passing through point (8,1) and tangent to two coordinate axes
• 6. If f (x) = AX3 + 3x2 + 2 and f ′ (- 1) = 4, then the value of real number a is equal to______ ．
• 7. If the line ax + 2Y + 1 = 0 is perpendicular to the line x + 3y-2 = 0, what is the value of a?
• 8. If three straight lines x-2y + 1 = 0, x + 3y-1 = 0 and ax + 2y-3 = 0 have two different intersections, then a=______ ．
• 9. If the line ax + 2Y + 2 = 0 is parallel to the line 3x-y-2 = 0, find the distance between the two parallel lines
• 10. If the line ax-2y + 2 = 0 is parallel to the line x + (A-3) y + 1 = 0, then the real number J? Find the real number a?
• 11. It is known that the eccentricity e of the ellipse x 2A2 + y 2B2 = 1 (a > b > 0) is 63, and the distance between the straight line passing through points a (0, - b) and B (a, 0) and the origin is 32
• 12. The condition of X corresponding to the point on the number axis whose distance from the origin is less than 8 is? A - 8
• 13. The distance from point a (3, - 4) to the x-axis is -- the distance to the y-axis is -- the distance to the origin is-------
• 14. The distance from the origin to the line x-2y + 4 = 0 is
• 15. If the distance from the line L to the line x-2y + 4 = 0 is equal to the distance from the origin to the line L, then the equation of the line L is ﹣ U
• 16. The distance from the origin to the line x + 2y-5 = 0 is___ ．
• 17. Find a point m on the straight line L: 3x-y-1 = 0 so that the distance difference between it and a (4,1) and B (0,4) is the largest, and find the maximum value
• 18. When a straight line passes through P (3,4) with an inclination angle of 45 degrees, find the distance between M and P at the intersection of the straight line and the straight line 3x + 2Y = 6 Wrong question. It's a-45
• 19. It is known that two points a (- 1, - 2) B (3,6) find a point P on the straight line L: 3x-3y-10 = 0, (1) minimize the distance between point P and a, B, (2) maximize the difference between point P and a, B, (3) minimize the sum of squares of the distance between point P and a, B
• 20. It is known that the distance between line L and points a (3,3) and B (5,2) is equal, and it passes through the intersection of two lines l1:3x-y-1 = 0 and L2: x + Y-3 = 0, then the equation of line L is