If the tangent line of circle x ^ 2 + y ^ 2-2x-4y-15 = 0 is made through point P (- 1, - 2), then the equation of tangent line is

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• 1. Tangent equation of point P (4, - 2) on circle X & sup2; + Y & sup2; - 2x + 4y-4 = 0
• 2. The equation of tangent passing through point P (2,3) leading circle x ^ 2 + y ^ 2-2x + 4Y + 4 = 0 is
• 3. ∫∫ x ^ 2 / y ^ 2D σ, where D is surrounded by the curve y = 1 / x, y = x, x = 1, x = 2
• 4. Teaching: the relationship between the value of double integral and the parity of integrand and the parity of integral region D Parity of integrand function with respect to X or Y What does it have to do with the value of the product? Compare this question: On the double integral of D: x ^ 2 * y DXDY D = {(x, y): x ^ 2 + y ^ 2 less than or equal to 2x} It is said that this double integral is equal to zero Why
• 5. Is the positive and negative of double integral related to the positive and negative of integral closed region? For example, if the same integrand is positive, but the closed region is positive In the first quadrant and the fourth quadrant, does the double integral become negative? In addition, is the definite integral also related to the positive and negative of the closed interval? For example, if they are all the same positive integrands, will the closed interval affect the positive and negative of the definite integral on the positive and negative half axes?
• 6. Double integral, the integrand is Max {(XY), 1}, and the integral region is 0
• 7. The weight ratio of the two baskets of apples is 5:3. Take 12 kg out of the basket and put it into the basket. At this time, the apples in the basket B are 8 kg more than those in the basket A. how many kg are the two baskets of apples?
• 8. If you increase the speed by 20%, you can arrive one hour earlier than the original time. If you drive at the original speed of 100 km, you will be able to get there, How many kilometers are there between a and B?
• 9. The fast train and the slow train leave each other from a and B. the fast train starts the whole journey 15 km and 11 km before the slow train starts. When they meet, the slow train runs 27% of the whole journey. It is known that the speed ratio of the fast train and the slow train is 5:4. How many kilometers are there between a and B?
• 10. When the plane flies between the two cities, it takes 4H to follow the wind and 5h to return against the wind. The speed of the plane in the still wind is 360km / h. calculate the wind speed and the distance between the two cities
• 11. Through P (4,1), make the tangent of the circle x ^ 2 + y ^ 2-6x-2y + 9 = 0, and find the tangent equation
• 12. From the point P (1, - 2) to the circle x ^ 2 + y ^ 2-6x-2y + 6 = 0, the tangent equation is
• 13. Finding tangent equation of circle x2 + Y2 + 2x-2y-3 = 0 passing through point (1,2)
• 14. Tangent equation of circle x2 + y2 = 4 through M (radical 3,1)?
• 15. The equation x2 + y2 = 4 of circle C makes two tangent lines of circle C through M (2,4) The equation x2 + y2 = 4 of circle C makes two tangent lines of circle C through M (2,4) The tangent point is a B The line AB just passes through the right vertex and the upper vertex of the ellipse T: x2 / A2 + Y2 / B2 = 1 Find t
• 16. Go through a point m (2,3) outside the circle x2 + y2 = 1, make two tangent lines Ma and MB of the circle, and the tangent points are a and B respectively, and find the equation of straight line ab
• 17. What is the tangent equation of a point m (4, - 3) over the circle x2 + y2 = 25
• 18. What is the length of the tangent line leading to the circle x square + y square - 4x-5 = 0 through a point P (7,0) Let's help
• 19. The tangent equation of circle x2 + y2-4x = 0 at point P (1,3) is___ ．
• 20. Through the point P (4,4), make the tangent line of the circle X & # 178; + Y & # 178; - 6x-4y + 12 = 0, and find the general equation of the tangent line