If three points a (2,2), B (a, 0), C (0, b) (AB ≠ 0) are collinear, then the value of 1A + 1b is equal to______
AB = (A-2, - 2), AC = (- 2, b-2), according to the meaning of the question, ab ‖ AC has (A-2) · (b-2) - 4 = 0, that is ab-2a-2b = 0, so 1A + 1b = 12, so the answer is 12
RELATED INFORMATIONS
- 1. The quotient of sixteen divided by four fifths minus four fifths of a number is twelve
- 2. The number of divisors of a number is______ Of which the smallest divisor is______ The greatest divisor is______ .
- 3. If the tangent equation of the curve equation f (x) = x & # 179; + 2x & # 178; - 3x at x0 is parallel to 2x-y-1 = 0, then the coordinates of the tangent point and the tangent equation at this point
- 4. When a curve passes through a point (2,3), any line segment between two coordinate axes is bisected by the tangent point?
- 5. A curve on the xoy plane passes through the point (2,3), and any line segment between the two coordinate axes is bisected by the tangent point According to the meaning of the topic, the intercept of the tangent of the curve at the point (x, y) on the two coordinate axes should be 2x and 2Y How do we get the intercept 2x and 2Y?
- 6. A curve passes through point (2,3). Any tangent line between its two axes is bisected by the tangent point. The equation of this line is obtained
- 7. When a curve passes through a point (2,3), any line segment between two coordinate axes is bisected by tangent point
- 8. Find the curve of a point (1, - 1) so that the tangent line at any point on the curve is bisected by the tangent line
- 9. It is proved that the length of the line segment between two coordinate axes of the tangent at any point on the curve X ^ 2 / 3 + y ^ 2 / 3 = a ^ 2 / 3 (note a > 0 constant, 2 / 3 is power) is fixed
- 10. The normal equation of a curve at a certain point Finding the normal equation of the curve y = e ^ - 2x at M (0,1) The answer is y '= - 2E ^ - 2x, so the tangent slope is - 2, so the normal slope is - 1 / (tangent slope) = 1 / 2 So the normal equation Y-1 = 1 / 2 (x-0) I don't know why "so normal slope is - 1 / (tangent slope) = 1 / 2" I don't know who can help me popularize the concept of normals and general methods
- 11. The method of summation of general terms of a sequence of numbers requires one or two examples Do not A1, A2, such as to see too much trouble, the best is the picture and so on. To add 1, 2 typical examples to the method! The standard alphanumeric is the same as the textbook. PEP B version. I'm from Shandong
- 12. If the curve represented by the equation x2 + Y2 + DX + ey + F = 0 (D2 + e2-4f > 0) is symmetric with respect to the straight line y = x, then there must be () A. D=EB. D=FC. E=FD. D=E=F
- 13. Calculate determinants 1, 2 n-1 n 2 3 … n 1 … … … … … n-1 n 1 Calculate determinants 1, 2 n-1 n 2 3 … n 1 … … … … … n-1 n 1 … n-2 n 1 2 … n-1
- 14. If a two digit number has 6 divisors and the sum of the smallest 3 divisors is 10, then the number is
- 15. One third by sixteen five by five fifths 2. (1 / 5 plus 2 / 3) times 15 / 3, 4 / 7 times 9 / 5 plus 3 times 9 / 5 of its branches
- 16. Given that AB is not equal to 0, and a and B are opposite to each other, find the value of AB + B / A + AB + A / b
- 17. For senior high school mathematics sequence with reverse order addition, split term method, combination method sum example RT!
- 18. If the circle x ^ 2 + y ^ 2 + DX + ey + F = 0 (d ^ 2 + e ^ 2-4f) is symmetric with respect to the straight line x + y = 0, then the following equation holds true A、D+E+F=0 B、D+F=0 C、D+E=0 D、E+F=0
- 19. Calculate determinant 1, 2, 2 2 2 2 2 … 2 2 2 3 … 2 … … … … … 2 2 2 … n
- 20. From 1 to 100, how many numbers have exactly six divisors