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Given the equation x2 + y2 = 25 of a circle, a straight line Ma, MB passing through M (- 4,3) intersects the circle at points a and B, and Ma, MB are symmetric with respect to the straight line y = 3, then the slope of the straight line AB is equal to () A. −43B. −34C. −54D. −45
A. If point a is (5,0), then the slope of Ma K1 = 3 − 0 − 4 − 5 = − 13mA, MB is symmetric with respect to the straight line y = 3, so the slope of MB is 13mb equation Y-3 = 13 (x + 4) y = 13X + 133 substituted into the equation of circle x2 + (13X + 133) 2 = 25x2 + 19x2 + 269x + 1699 = 255x2 + 13x-28 = 0 (x + 4) (5x-7) = 0x = - 4 (rounding) or x = 75 substituted into MB equation y = 245, so a (5,0) & nbsp; & nbsp; &So the slope of line AB is k = 245 − 075 − 5 = − 43, so choose a
Find the meaning of an English phrase
Phrase: just 800 kms south in Mexico
It's only 800 kilometers south of Mexico
What about the preposition in here?
South in Mexico refers to the territory of Mexico
3. 11, 13, 29, 41 these five natural numbers, each time take two numbers as a fraction of the numerator and denominator, a total of how many can constitute the simplest fraction
3. Among the five natural numbers 11, 13, 29 and 41, how many minimalist fractions can be formed by taking two numbers each time as the numerator and denominator of a fraction?
They are 11 / 3, 13 / 3, 29 / 3, 41 / 3, 3 / 11, 13 / 11, 29 / 11, 41 / 11, 3 / 13, 11 / 13, 29 / 13, 41 / 13, 3 / 29, 11 / 29, 13 / 29, 41 / 29, 3 / 41, 11 / 41, 13 / 41, 29 / 41
Can the noun be plural?
The means "this / that / this / those". It can be used before singular or plural nouns
The tree, the teacher, the teacher
The trees, the teachers
Given the vector AB, satisfying a = 2, B = 4, the angle between vector a and B is 60 degrees, if vector a = 3b is perpendicular to vector Ka = B, then the value of real number k is 0
A13/4 B4/13 C9/4 D4/9
(a + 3b) *
15 English verb phrases
*** of primary school
As shown in the figure, △ ABC, e and G are respectively the midpoint of AB and AC, de ⊥ AB and FG ⊥ AC. if ∠ BAC = 110 °, calculate ∠ DAF
∵ E and G are the midpoint of AB and AC, de ⊥ AB, FG ⊥ AC, ∵ Da = dB, FA = FC, ∵ B = ∵ DAB, ∵ C = ∵ fac, ∵ BAC = 110 °, ∵ B + ∵ C = 180 ° - BAC = 180 ° - 110 ° = 70 °, ∵ DAB + ∵ fac = 70 °, ∵ DAF = 110 ° - 70 ° = 40 °
The dictionary is mine?
The dictionaries are mine.
Sometimes it's plural, sometimes it's just a part of it. When should it be changed and when should it be unchanged?
There are two kinds of reform
1. The dictionaries are ours
2. The dictionaries are mine
Hope to inspire you
In the triangle ABC, D is the midpoint of AC, e is on AB, BD and CD intersect at F, AE / AB = 3 / 4, then BF / FD is equal to___ .
a.1/2
b.1/3
c.2/3
d.3/4
Select C 2 / 3
If the auxiliary line passes through point D as DH \ \ CE, we can get that h is the midpoint of AE, because AE / AB = 3 / 4, so be / eh = 2 / 3,
Because BF / FD = be / eh, C
Your, on, where, go, did, you, holiday
Where did you go on your holiday.
RELATED INFORMATIONS
- 1. It is known that the hypotenuse of a right triangle is 4.5 meters and a right side is 2 meters. What is the angle between them
- 2. Without changing the value of the fraction, the coefficients in the numerator denominator of the fraction x + (Y / 3) / (1 / 4) x-2y are changed into integers fast
- 3. Without changing the value of the fraction 2x-5 / 2Y / 2 / 3x + y, the fraction after the coefficients in the fraction are changed into integers is___________
- 4. 0.3x + 0.2y/0.4x-0.1y does not change the value of the fraction, and the coefficients of the numerator and denominator in the fraction are changed into integers
- 5. If the absolute value of the coefficients in the numerator and denominator is the smallest integer, then the numerator and denominator of the fraction (0.02x + 0.06y) / (0.8x-0.2y) are multiplied by ()
- 6. Without changing the value of the fraction, the coefficients of the numerator and denominator of the following formulae are changed into integers (1) 1.03x + 0.02y/3.2x-0.5y (2) 3x of 4-2y of 3 / 1X of 3 + 5Y of 2
- 7. If X-Y = 3xy = 10, then the square of X + the square of y =?
- 8. 1 / 2, 3 / 4, 5 / 8
- 9. General score: (1) 1 / A + 1,3 / 1-A, 5 / A ^ 2-1 (2) a / A ^ 2-4, A-1 / A-2, a + 2 / A ^ 2-4a + 4
- 10. What's the difference between 8 and 27?
- 11. On the linear equation of one variable with absolute value Solve the following equation: 1.|x-|3x+1||=4 2.|x+3|-|x-1|=x+1 3.|x-1|+|x-5|=4 1. Discuss the number of solutions of the equation | 2x-2 | + | 2x-5 | = a about X 2. Given that the equation | x | = ax + 1 has a negative root but no positive root, find the value range of A
- 12. The points P (a, - 2), q (2, b), PQ are parallel to the x-axis. Find the values of a and B
- 13. How to solve the equation x / 4-0.6 = x / 8 + 0.1 Today, urgent, step by step
- 14. The perimeter of a square and a circle are equal, and the area of the circle must be larger than that of the square______ (judge right or wrong)
- 15. How to prove that the image is infinitely close to the x-axis? X ≥ 0, a ≠ 0 (originally a physics problem in Senior Two) because the teacher didn't understand what I said, it was transformed into a mathematical model
- 16. When a letter is multiplied by a number and the multiplication sign is omitted, () is usually written before ()
- 17. What is the derivative of F (x) = 1 / xlnx f(X)=1/(xlnx)
- 18. English translation Yao Ming has more than just size:he also has great skill and speed and he is a team player.Yao Ming is the son of two great basketball players and learnt how to play one of the world's most popular games when he was young.Now ,as one of the stars in the NBA, Yao Ming is working hard to live his dream and show the world that Chinese basketball players love this game too!
- 19. As shown in the figure, △ ABC is an equilateral triangle, points D and E are on AB and AC respectively, and F is the intersection of be and CD. It is known that ∠ BFC = 120 °. Verification: ad = CE
- 20. Given that vectors a and B satisfy the following conditions: the module of vector a = 5, the module of vector b = 3, and the module of vector A-B is 7, find the point multiplication of vector a and B