As shown in the figure, in △ ABC, the bisector of ∠ a = 90 ° and ∠ B intersects AC at D, ah and DF are perpendicular to BC, h and F are perpendicular feet

In △ abd and △ FBD, the bisector of ∵ B intersects AC at D, ≌ abd = ∠ DBF. In △ abd and △ FBD, ≌ BD = BD, ≌ FBD, ≌ ade = EDF, ad = DF, ≁ ah ⊥ BC, DF ⊥ BC, that is AE ∥ DF, ≌ AED = EDF = ade, ≌ AE = ad and ad = D

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1. As shown in the figure, in △ ABC, the bisector of ∠ a = 90 ° and ∠ B intersects AC at D, ah and DF are perpendicular to BC, h and F are perpendicular feet
2. As shown in the figure, in △ ABC, the bisector of ∠ a = 90 ° and ∠ B intersects AC at D, ah and DF are perpendicular to BC, h and F are perpendicular feet
3. RT triangle ABC, ∠ a = 90 °, bisector of ∠ B intersects AC at D, vertical line from a as BC intersects BD at e, and vertical line from D as DF, so aefd is proved to be diamond
4. As shown in the figure, in RT △ ABC, the bisector of ∠ a = 90 °, the bisector of ∠ B intersects AC at e, the height ah on the side of intersecting BC is at D, DF / / BC intersects AC at F through D, and the verification is: AE = FC
5. Cdef is the inscribed square of RT triangle ABC, BC = 2, AC = 1, find the square cdef area
6. In △ ABC, ∠ C = 90 °, D, e and F are points on edges AB, AC and BC respectively, and the quadrilateral decf is a square if ad = 7
7. If ad = 6 and BD = 5, the sum of areas of △ ADF and △ BDE can be obtained
8. In the triangle ABC, ∠ ACB = 90 ° points D and E are the middle points of AC and ab respectively, point F is on the extension line of BC, tangent ∠ CDF = ∠ a, prove that decf is ‖ quadrilateral
9. In △ ABC, ∠ BCA = 90 degrees, D and E are the middle points on the sides of AC and ab respectively, f is on the extension line of BC, ∠ CDF = ∠ a It's a proof
10. In △ ABC, ∠ ACB = 90 °, De is the median line of △ ABC, point F is on the extension line of BC, and ∠ CDF = ∠ a
11. What is the full English name of NBA, PRC, VOA, EQ and WTO
12. It is known that in △ ABC, ab = 20, AC = 15, and the height of BC is 12, then the length of BC is______ ．
13. How to use the inverse function method to find the range of y = CX + D / ax + B (a ≠ 0)
14. The range of function y = x ^ 2-2x + 2, X ∈ [2,7] is
15. Let f (x) = ax & # 178; + BX + C (a > 0), and f (1) = - A / 2 (1) Prove that the function f (x) has two zeros. (2) let X1 and X2 be the two zeros of the function f (x), and find the absolute value range of x1-x2. (3) prove that the function f (x) has at least one zeros in (0,2) Is to find the value range of the absolute value of x1-x2
16. The relationship between the absolute value of a number and the opposite number is expressed in symbolic language Be correct and positive
17. When calculating 25 + A, Xiao careless mistakenly regards + as a - sign and gets 17, then the correct answer to 25 + A is ()
18. Simple calculation of 100 * 7.9 + 184 * 2.1 + 84 * 2.9
19. K in y = KX + B is the slope. What is the slope
20. Given that point a (- 3,2a-1) and point B (B, - 3) are symmetric with respect to the origin, what is the coordinate of the symmetric point P 'of point P (a, b) with respect to the y-axis?