The distance from the focus to the collimator is the standard equation of two parabola

This problem is discussed in four situations

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1. The distance from the focus to the collimator is 4, and the standard equation of the parabola is obtained
2. If the Quasilinear equation of parabola y = ax & # is y = 2, then the value of a is
3. If the Quasilinear equation of parabola y = ax & # is Y-2 = 0, then the value of a is
4. If the Quasilinear equation of parabola y = AX2 is y = 3, then the value of a
5. What is the Quasilinear equation of parabola y = - 1 / 8 * x ^ 2 To solve the problem process
6. The Quasilinear equation of parabola x2 = y is______ ．
7. The Quasilinear equation of parabola x2 = y is______ ．
8. Let f (x) = 1 + SiNx / X and point out the discontinuity of F (x) F (x) = 2, x = 0, how to calculate 2 here, please explain in detail
9. In the sequence an, A1 = 1, an + 1 = 2An + 2 ^ n, 1. Let BN = an / 2 ^ n-1. Prove that the sequence BN is an arithmetic sequence; can we not use the same division 2 ^ (n + 1) I mean to use the construction method to make a (n + 1) + k = 2 (an + k), but I use this method to find an = 3 * 2 ^ (n-1) - 2 ^ n, which is different from Baidu
10. If the average of sample x1, X2, X3 is 2 and the variance is 3, then the average of sample 2x1 + 1,2x2 + 2,2x3 + 1 is (), and the variance is ()
11. The standard equation of parabola whose distance from focus to collimator is 2 is obtained
12. On the formula of circle, sector area, triangle in circle,
13. Area formula of sector (two) Just the formula!
14. What is the area formula of sector? Use letters!
15. What is the formula of sector area?
16. What is the formula for calculating the sector area?
17. Calculation formula of sector area The central angle of the circle is the area of a sector with a radius of 3 cm at 120 degrees
18. Sector area formula
19. Formula of chord length with known radius and arc length *What is it ^ what is it
20. For example, 1km / h = m / s, 1m / min = km / min