If the focal length of ellipse x ^ 2 / m ^ 2 + y ^ 2 / 4 = 1 is 2, then the value of positive number m is 2______

When m ^ 2 > 4, M is the root 5; when m ^ 2 > 4, M is the root 5

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1. Given that the elliptic equation is x28 + y2m2 = 1, the focal length is equal to () A. 28−m2B. 222−|m|C. 2m2−8D. 2|m|−22
2. Taking the vertex of the major axis of the ellipse with 25 / x square plus 9 / y square equal to 1 as the focus, the hyperbolic equation with the focus as the vertex is?
3. It is known that an ellipse with 4 / 2 of x plus 3 / 2 of Y equals 1, and a parabola with y equals 4x square Find the focal length of ellipse. 2, find the focal coordinate of parabola and the equation of collimator
4. Ellipse C rectangular coordinate equation 4 / x square + 3 / y square = 1, determine the value range of M, straight line L; y = 4x + m, there are two different points on ellipse C symmetrical about straight line L Please know the answer to this question friends, can give detailed and quick reply, thank you
5. What is the chord length of ellipse x square + 4Y square = 16 cut by straight line y = x + 1?
6. Given the ellipse G: x ^ 2 + y ^ 2 / 4 = 1, make the tangent l of circle x2 + y2 = 1 through point P (0, m), and l intersect the ellipse g at two points a and B to find the focus coordinates and eccentricity of the ellipse G Try to express the absolute value of AB as a function of M, and find the maximum absolute value of ab
7. Given that the ellipse C: x ^ 2 / A ^ 2 + y ^ 2 / b ^ 2 = 1, the straight line L is a tangent of the circle O: x ^ 2 + y ^ 2 = B ^ 2 and passes through the right focus F of the ellipse, the eccentricity of the ellipse is E If the inclination angle of L of the straight line is π / 6, find the value of E Is there such e? Is the symmetric point of the origin o about the straight line L exactly on the ellipse C? If so, find out E. if not, explain the reason
8. It is known that a straight line y = X-1 and an ellipse (x ^ 2 / M) + (y ^ 2 / m-1) intersect at two points a and B. If a circle with diameter AB passes through the focus F of the ellipse, then the value of M is
9. If the point F is the left focus of the ellipse x ^ 2 / A ^ 2 + y ^ 2 / b ^ 2 = 1 (a > b > 0), the point F is the tangent of the circle x ^ 2 + y ^ 2 = B ^ 2, intersects the ellipse at the point P, and the tangent point q is the midpoint of the line FP, then the eccentricity of the ellipse is 0
10. If the focus of the ellipse x ^ 2 / A ^ 2 + y ^ 2 / b ^ 2 = 1 passes through the point (2,4) on the X axis, make the tangent of the circle x ^ 2 + y ^ 2 = 4 If the tangent points are a and B, and the line AB just passes through the right focus and upper vertex of the ellipse, what is the elliptic equation
11. If the focal length of ellipse x ^ 2 / M + y ^ 2 / 2 = 1 is the same as that of ellipse x ^ 2 / 8 + y ^ 2 / 18 = 1, then the value of M is?
12. If the focal length of the ellipse x2m + y24 = 1 is 2, then the value of M is equal to______ ．
13. If the ellipse x ^ 2 / m ^ 2 + y ^ 2 / 4 = 1 passes through the point (- 2, √ 3), then its focal length is the required process. Thank you
14. If the focal length of the ellipse x2m + y24 = 1 is 2, then the value of M is equal to______ ．
15. It is known that the focal length of ellipse C equation is 4 and the equation of solving ellipse through P [√ 2, √ 3]
16. 8. Given that the equation of ellipse C is, try to determine the value range of M, so that for a straight line, two different points on ellipse C are symmetrical about the straight line 8. It is known that the equation of ellipse C is x2 / 4 + Y2 / 3 = 1. Try to determine the value range of M, so that for the straight line y = 4x + m, there are two different points on ellipse C symmetrical about the straight line
17. If the focal length, minor axis length and major axis length of an ellipse form an arithmetic sequence, then the eccentricity is______ ．
18. If the major axis of an ellipse has the same length, the minor axis length and the focal distance form an arithmetic sequence, then the eccentricity is? How to calculate
19. The eccentricity of an ellipse is () A. 45B. 35C. 25D. 15
20. If the length of the major axis, the length of the minor axis and the focal distance of an ellipse form an arithmetic sequence, then the eccentricity of the ellipse is zero______ ．