In △ ABC, ad, be and CF are bisectors of three internal angles respectively, which intersect at O and og ⊥ BC, and the perpendicular foot is g Same topic

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• 2. If the two sides of a triangle are 3cm and 5cm in length, and the cosine of the angle is the root of the equation 5x & sup2; - 7x-6 = 0, what is the area of the triangle?
• 3. Schematic diagram of lever principle in push up Push up is a hard lever, please draw the arm and fulcrum, dynamic resistance
• 4. Try to discuss the application of Maslow's hierarchy of needs theory in management
• 5. Point P and point q are on the line AB, and AP: Pb = 3:2, AQ: QB = 3:4, PQ = 3, find the length of line AB?
• 6. In RT triangle ABC, angle c = 90 degrees, angle a = 45 degrees, and ab = 8 AC.BC
• 7. If there is a common point between the line L passing through point a (3,0) and the curve (x-1) 2 + y2 = 1, then the value range of the slope of the line L is () A. (−3，3)B. [−3，3]C. (−33，33)D. [−33，33]
• 8. It is known that the parabola y = x ^ 2 + 2x + m intersects with X axis at two points AB, and the equation of a circle with diameter AB is obtained
• 9. What graph does the equation x = e ^ t + e ^ - t, y = e ^ t + e ^ - t (t is a parameter) represent Why a hyperbola x ^ 2-y ^ 2 = 4 instead of a straight line x = y
• 10. In △ ABC, a > b > C, and C = (a + b) / 2, if vertex a (- 1,0), B (1,0), find the trajectory equation of vertex C
• 11. In the triangle ABC, AB > AC, AF is the angle bisector, D is the point on AB and ad = AC, de ‖ BC intersects AC at e to prove the angle EDF of CD bisector
• 12. How to find a and B
• 13. A minimalist fraction, expand its numerator by three times, reduce its denominator by two times, and it becomes 92. Can you find out what the original minimalist fraction is?
• 14. Solving a big problem of triangle and vector in Mathematics Let a = (SiNx / 2, root 3cosx / 2) and B = (cosx / 2, cosx / 2). Let f (x) = a · B (1) Find the zero point of function f (x) on [0,2] () let the opposite sides of △ ABC inner angles a, B and C be a, B and C respectively, and f (a) = root 3 If you're not finished, add: B = 2, Sina = 2sinc, find the value of C
• 15. Solve the combination of triangle and vector It is known that a, B and C are the opposite sides of three internal angles a, B and C of Δ ABC, vector m (radical 3, - 1) and vector n (COSA, Sina). If vector m, vector N and acosb + bcosa = csinc, then angle B =?)
• 16. Solving triangle with vector In △ ABC, the opposite sides of angles a, B and C are a, B, C and Tanc = 3 times the root sign 7, so COSC can be obtained
• 17. A problem of solving the combination of triangle and vector In the triangle ABC, h is perpendicular, the dot product of vector BH and vector BC is 6, the sum of squares of sina and sinc = the square of SINB + Sina * sinc Find: (1) angle B (2) When the radius of circumcircle r of triangle ABC is the smallest, the shape of triangle ABC can be judged
• 18. High school mathematics vector inequality synthesis Given the vector a = (y, x + 5), B = (y, x + 5), x > 0, Y > 0, and a is perpendicular to B, what is the minimum value of XY Change a = (4-x, 1)
• 19. It's almost the first semester of senior high school. We need to learn compulsory five in Mathematics: solving triangles, sequence of numbers and inequality. How much do these have to do with compulsory one?
• 20. It is known that m.n is the midpoint of vector AB and vector CD of any two line segments, and the vector Mn = 1 / 2 (vector AD + vector BC) is proved