0.375=9( )=______ ÷16=______ ：8=______ %

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• 2. What is 364.3 and 15.4?
• 3. What is the least common multiple of 63, 27 and 36
• 4. （1988+1986+1984+… +6+4+2）-（1+3+5+… +1983+1985+1987）
• 5. Four times bracket 9.3 minus 5.7 brackets plus 3.6.0.67 times 99 plus 0.67.4.25 divided by 2.5 times 101 minus 1.7.6.8 plus 1.25 times 6.8 times 8. Please help me use the simple method of off formula calculation, and write down the process
• 6. The focal coordinates of the parabola y2 = 8x are______ ．
• 7. The square of the parabola y = - x, the focal coordinate is? I don't have any more,
• 8. What is the focus coordinate of the square of the emergency parabola y = x
• 9. The focus coordinate of the parabola y = - x is
• 10. If the square of the parabola y is equal to 2px (P is greater than 0), the distance between the big focus of the point with abscissa 2 is 3, then the value of P is 0
• 11. 76 * (1 / 23-1 / 53) + 23 * (1 / 53 + 1 / 76) + 53 * (1 / 23-1 / 76), please explain the reason, thank you!
• 12. Seven fifths of an hour equals () hours How to calculate Seven fifths of an hour equals () hours One sixth of five thousand meters equals () kilometers Two thirds of 15 yuan is () yuan One half of two thousand meters is () meters fraction
• 13. 2005*3/8—0.375*1949+3.75*10.4
• 14. There is a problem: evaluate 1 / 3 (- 3x ^ 2 = 6x-12) - 1 / 2 (4x-2x ^ 2), where x = 2010, But his calculation is also correct. What do you think is the matter?
• 15. What month is the average maximum temperature in the southern hemisphere
• 16. Is 2000 a leap year? Because leap year is divisible by 4, but not by 100, or divisible by 4, and divisible by 400 Push like this, 2000 is and is not? Who can explain why? How do you explain my definition?
• 17. Given that point P is a point outside the circle C: x ^ 2 + y ^ 2 = 1, let K1 and K2 be the slopes of two tangent lines of circle C passing through point P K1 * K2 = - λ (λ does not = - 1,0), find the equation of the locus m of point P, and point out the type of conic where the curve m lies
• 18. 1. Draw a secant from a point outside the circle P (1,1) to the circle x2 + y2 = 1, intersect the circle at two points a and B, and find the trajectory equation of the midpoint of the chord ab
• 19. In the plane rectangular coordinate system, the coordinates of the end point of the line AB are a (- 2,4), B (4,2), and the line y = kx-2 always has an intersection with the line. The value range of K is calculated After taking the endpoint coordinates in, we can calculate k = 1 and K = - 3. Why should it be greater than or equal to 1 and less than or equal to - 3
• 20. When t belongs to R, the graph represented by parameter equation x = (- 8t) / (4 + T ^ 2), y = (4-T ^ 2) / (4 + T ^ 2) is____