The distance from a focus of hyperbola x2a2 − y2b2 = 1 (a > 0, b > 0) to an asymptote is () A. aB. bC. cD. b2

A focus of hyperbola is (C, 0), an asymptote is y = Bax, and the distance between focus and asymptote is bcb2 + A2 = B, so B is chosen

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1. Xiao Ming accidentally landed the kite on the 4.8-meter wall when he was flying the kite. He asked his father to help him get it. His father moved the ladder and placed it stably (the distance between the low end of the ladder and the wall is about 1 / 3 of the length of the ladder). At this time, the top of the ladder just reached the wall. His father asked Xiao Ming if the length of the ladder is 5 meters? Can you help Xiao Ming calculate it together? Steps and formulas are required
2. C language, find the root of quadratic equation AX2 + BX + C = 0
3. -A is the opposite of a, so - a must be negative? A must be greater than - a? Please give an example
4. It is known that the discriminant of the equation x & # 178; - (M + 2) x-2n = 0 about X is equal to 0, and x = 1 / 2 is the root of the equation
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8. How to solve x + y + Z = 17 2x-y-2z = 1 3x + y-4z = 3
9. 2x-y+2=8 y+2z=-2 3x+y-4z=1
10. If x and y are opposite to each other, then the solution of {3x + 2y-z = 1,2x-y + 2Z = 8 is
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15. If the polynomial x2-3kxy-3y2 + 6xy-8 contains no XY term, then K=______ ．
16. If the polynomial x ^ 2 + 3kxy-3y ^ 2 + 6xy-8 contains no XY term, then K=_________
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18. When k takes what value, the square of polynomial x-3 + 1 / 2xy-3y + 4kxy has no XY term
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