Let C: x ^ 2 + y ^ 2 + 4x-6y = 0, if C is symmetric with respect to the line L: a * (x-2y) - (2-A) * (2x + 3y-4) = 0, find the value of real number a
If the center of the far circle is (- 2,3), symmetric to L, then l must pass the center of the circle
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- 1. 2.1×1.1×0.54÷(5.4×1.21÷521)=______ .
- 2. Calculate and output the square root of the sum of all prime numbers from 3 to 100 (including 3 and 100)
- 3. The set of points equidistant from a pair of parallel lines 5x-2x-6 = 0, 10x-4y + 3 = 0 is
- 4. Simple calculation of 21 / 5 * 1 / 31 + 4 / 5 * 21 / 31
- 5. Calculate and output the sum of the square roots of all prime numbers from 3 to N, n > 2, different > 100
- 6. Given two straight lines L1: MX + 8y + n = 0 and l: 2x + MY-1 = 0, try to determine the value of M, n 1: L1 and L2 intersect at point (m, - 1) 2: L1 is parallel L2 3: L1 is vertical L2, and the intercept of L1 on Y axis is - 1
- 7. Is there a simple algorithm for 1.21 × 32 - [5.14 + 7 / 50] and how to calculate it?
- 8. If the sum of three times of a prime number and two times of another prime number is 100, what are the two prime numbers
- 9. Given two straight lines L1: MX + 8y + n = 0 and L2: 2x + MY-1 = 0, find the value of M, N, satisfying the following conditions. (1) L1 and L2 intersect at point (m, - 1) (2) L1 is parallel to L2
- 10. Calculation: 321 × 654 ﹣ 987 ﹣ 654 × 987 ﹣ 321=______ .
- 11. How to use C + + program to judge whether a number is prime or not
- 12. 2.1×1.1×0.54÷(5.4×1.21÷521)=______ .
- 13. It is known that two straight lines L1: ax by + 4 = 0, L2: (A-1) x + y + B = 0. The line L1 is parallel to L2, and the distance from the origin of the coordinate to L1 and L2 is equal. The value of a and B can be obtained
- 14. If the moving points a (x1, Y1) and B (X2, Y2) move on the line L1: x + Y-7 = 0 and L2: x + Y-5 = 0 respectively, the minimum distance from the midpoint m of line AB to the origin is () A. 23B. 33C. 32D. 42
- 15. If line L1: ax by + 4 = 0 and line L2: (A-1) x + y + B = 0 are parallel and the distance between the two lines at the origin is equal, find a and B Doesn't that mean the two lines coincide? I'm a / (A-1) = - B / 1 = 4 / b I see, but why can't I work out the answer by using the distance equality formula
- 16. If two straight lines ax-by + 4 = 0 and (A-1) x + y + B = 0 are parallel and the distance from the origin of the coordinate to the two straight lines is equal, find the straightness of a and B
- 17. The expression of L1 and L2 is y = 3 / 4x + 3, y = 3 / 4x-3, then the distance between these two parallel lines is
- 18. According to the following conditions, find the distance P1 (0, - 2) P2 (3,0) p1 (- 3,1), P2 (2,4) p1 (4, - 2) P2 (1,2)
- 19. Given that a line L is parallel to the X axis, P1 (- 2,3) P2 (X2, Y2) is two points on the line L, and the distance between P1 and P2 is 4, then the coordinate of P2 is
- 20. If the points P1 (- 1,3) and P2 (1, b) are known, and p1p2 is parallel to the X axis, then B =?