5. P is the point on the right branch of hyperbola x ^ 2 / 9-y ^ 2 / 16 = 1, m and N are the points on the circle and circle respectively, and the maximum value of pn-pm can be obtained

There are few conditions for this question. The circle is not given. You can refer to a multiple-choice question in the 2006 Jiangxi college entrance examination. It should be the same

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2. In 2005, the number of days with excellent air quality accounted for 5 / 3 of the whole year?
3. 1. Calculation: X-Y of X + y + Y-3 of 2x 2. Calculation: x + 3 of X & # 178; - X-2 divided by (2-x) + X + 3 of X + 1
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11. (2011 · Anhui simulation) if the point P (1,1) is the midpoint of the chord Mn with circle (x-3) 2 + y2 = 9, then the linear equation of the chord Mn is () A. 2x+y-3=0B. x-2y+1=0C. x+2y-3=0D. 2x-y-1=0
12. It is known that the parameter equation of the straight line is x = 1 + 2T, y = 2 + t Given the linear parameter equation {x = 1 + 2T, y = 2 + T (t is the parameter)}, then the chord length of the line cut by the circle x ^ 2 + y ^ 2 = 9 is In my teaching assistant answer, I changed this formula into x = 1 + 2 / root 5T and y = 2 + 1 / root 5T. How does this change
13. It is known that the equation of a circle is (x-1) 2 + y2 = 9, and the tangent equation of a circle passing through a point (- 2,4) is obtained
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15. As shown in the figure, D is the midpoint of the AC side in the equilateral triangle ABC, e is on the extension line of BC, de = dB, if the perimeter of △ ABC is 6, then the perimeter of △ BDE
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19. The second grade of junior high school Given the linear function y = KX + B, if y increases with the increase of X, which three image limits does the function image pass through? The correct answer is one two three quadrants. Why is there no one three four quadrants? Y increases with the increase of X. isn't the image rising from left to right? Why is there only one two three quadrants?
20. 1. Find the root sign (1 + 2 * sin610 ° * cos430 °) / sin 250 ° + cos 790 ° PS: the root sign is 1 + 2 * sin610 ° * cos430 ° 2. Given Tan a = - 3, find the value of the following formula: (1)(4*sin a-2*cos a)/(5*cos a=3*sin a) (2) (sin a-cos a)^2 There should be a specific process